Storm Acuity Controller Build - Baldur's Gate 3 (BG3)

The Storm Acuity Controller Build

The build is the ultimate lightning caster, that can cover the whole battlefield in electricity, while dishing out insane numbers of damage, while also maintaining very high Spell Save DC thanks to Arcane Acuity. We will utilize the Electrified Water mechanic that gives you buffs during enemy turn, and also weakens them at the same time. This is available via unique gear - Luminous Armour and Callous Glow Ring.

So the core aspect is being able to build your Arcane Acuity​ both during your turn and outside of it. This sounds neat and gives a pretty unique playstyle. The main idea here is that Gloves of Battlemage's Power work in various questionable ways, allowing you to combine them for very powerful setups.

For example, landing Booming Blade​ + Metamagic: Extended Spell​ will give plenty of stacks to ensure that you have a very high spell success chance. In addition, using Create or Destroy Water​ + The Watersparkers creates electrified water, which in turn triggers Electrocuted,​ followed by Arcane Acuity​ from Gloves of Battlemage's Power. Pretty neat, right?

With all this in mind, you will cover all the important aspects to be an effective caster. But remember, this is a lightning-themed Sorcerer, so you can land various powerful spells - Lightning Bolt, Chain Lightning, Chromatic Orb: Lightning​ and then trigger Heart of the Storm​ for even more additional damage.

So the build does depend on a few items, and depending on your party setup, it can impact how other classes will have to respond, with some of the items taken. Still, if you are ready to pour your resources into this one, you will be extremely satisfied. 

So let's go into the build! The big inspiration is grousedrum's Acuity Sorc build.

Class Contribution

The build consists mainly of 2 classes:

11 Storm Sorcerer

• Constitution saving throw proficiency to help maintain spell concentration when being hit.
• Tempestuous Magic​ is a great utility spell that allows you to fly around the battlefield once you cast a spell. This does have its uses when you want to get into a perfect position.
• Access to good defensive spells, like Shield​ to improve survivability.
• Access to cold and lightning spells - Lightning Bolt, Cone of Cold, Chain Lightning, etc.
• Access to a variety of cantrips like Friends, which are especially useful if you are the main character, as you can win over the dialogues
• Metamagic mechanic and Sorcery points. You will be able to cast full spells using Metamagic: Quickened Spell, giving a unique advantage over normal cleric builds. Metamagic: Extended Spell​ is another beast with lots of interesting mechanics.
• Heart of the Storm​ allows for additional damage when casting lightning or thunder spells. It also passes damage riders like Callous Glow Ring.
• Additional storm-themed spells - Create or Destroy Water, Sleet Storm, Call Lightning, etc.

1 Hexblade

• Bind Hexed Weapon​ - the main level 1 highlight from Hexblade, which makes the weapon use Charisma as the main modifier. 
• Warlock Spellslots that reset on short rest.
• Hex Warrior​ with bonus proficiencies in Medium Armor and Shield. This also lets you use Bind Hexed Weapon​ to use Charisma as the main weapon stat. This is important as it will let use Booming Blade​ for very interesting combos later on.
• Hexblade's Curse​ - not that important for the build, as it already has plenty of good uses for a bonus action.

Build Variations

Here are some variations that work similarly and utilise the same classes at their core.

Setup	Description
1 Paladin 11 Storm Sorcerer	Pick the Oath based on your personal roleplay. Paladin comes with so needed armor proficiencies that allows to wear anything from light to heavy armour.
1 Fiend Warlock 11 Storm Sorcerer	The split allows the use Command. Another good addition is light armour proficiency, giving additional clothing options.
2 Tempest Cleric 10 Storm Sorcerer	If you are okay with forgoing level 6 spells (you will still get level 6 spell slots), and use scrolls, this allows getting Destructive Wrath​ for maximum lightning damage. You also get Command,​ but it is Wisdom-based. Still with +10 to Spell Save DC, you should be able to land against most enemies.

Leveling Overview

Here is a concise table with all the main picks during your levelling progression. For more detailed reasoning, I go further in the article. Also, do not forget to check the recommended gear, as it is crucial.

Level	Class	Selection
1	Sorcerer 1	Cantrips: Ray of Frost, Minor Illusion, Friends, Shocking Grasp​
		Spells: Magic Missile, Mage Armour​
		Subclass: Storm Sorcery
		Abilities: STR - 8, DEX - 16 (15+1), CON - 14, INT - 8, WIS - 10, CHA - 17 (15+2)
		Skills: Deception, Persuasion
2	Sorcerer 2	Spells: Shield​
		Metamagic: Metamagic: Twinned Spell, Metamagic: Extended Spell​
3	Sorcerer 3	Spells: Cloud of Daggers​
		Metamagic: Metamagic: Quickened Spell​
4	Sorcerer 4	Cantrips: Booming Blade​
		Spells: Chromatic Orb​
		Feat: Dual Wielder​ or Ability Improvement - +2 Charisma
5	Sorcerer 5	Spells: Lightning Bolt​
6	Sorcerer 6	Spells: Fear​
		Replace Spell: Cloud of Daggers​ -> Counterspell​
7	Sorcerer 7	Spells: Confusion​
8	Warlock 1	Cantrips: anything
		Subclass: Hexblade
		Spells: Shield​, Armour of Agathys​
9	Sorcerer 8	Spells: Blindness​
		Replace Spell: Mage Armour​ -> Ice Storm​
		Feat: Alert​, Ability Improvement - +2 Charisma, War Caster: Concentration​
10	Sorcerer 9	Spells: Hold Monster​
11	Sorcerer 10	Cantrips: anything
		Spells: choose preferred
		Metamagic: Metamagic: Heightened Spell​ or Metamagic: Distant Spell​
12	Sorcerer 11	Spells: Chain Lightning​
		Replace Spell: Shield​ -> Globe of Invulnerability​

Synergy with other builds

The build is a hoarder of items, so first, it will definitely need Gloves of Battlemage's Power, so have this in mind when choosing companions. Second, is the question of how much powerful you want this to be, so let's go through a few options:

Having a Cleric in the party

The Storm Acuity Sorcerer build can utilise Luminous Armour to have an easy source of Radiating Orb​ applied via the electrified water. However, this means that many base cleric setups, which rely on Luminous Armour, lose one of the most important chestpieces. If you want to run a Spirit Guardians cleric, I would then prioritize this armor on them, but remember, Electrified Water will kind of hurt them also.

If you still decide to use the Luminous Armour on the build and want a cleric, I would recommend this Life Cleric build. It uses a bit different item setup. Otherwise, you can run all the other popular Cleric builds like Light Cleric, Tempest Cleric, Nature Cleric, etc. and give the armour to them.

Other Lightning and Cold Casters

As you will be applying Wet​ on enemies, you can add to your group almost any caster that can use cold or lightning spells. This will make it very easy to deal huge amounts of damage in a single turn.

• The main highlight would be Land Druid. A very popular variation of it is Thundersnow Herald, which comes with both Cold and Lightning spells for total annihilation.
• Sorcadin with access to Lightning Bolt.
• Giant Barbarian with its Elemental Cleaver​ that allows it to imbue both cold and lightning damage.
• Many of the Sorcerer and Wizard variations - Storm Sorcerer, Talos Dragonling Build, Cold Sorcerer, Abjuration Wizard, etc.

Archers

Feel free to run any archers. They can shoot from afar and can avoid electrified water effects. Moreover, they can use various elemental arrows, which allow them to better exploit the Wet​ condition:

• Hunter Ranger, Arcane Archer, Gloomstalker Assassin, Gloomstalker Thief, Swords Bard Archer, etc.

Frontliners

The build is not really friendly to them. The main problem is that your electrified water will damage them, and if you are using Callous Glow Ring and Luminous Armour each tick will apply Radiating Orb on your allies.

Of course, this also will give you more Arcane Acuity stacks, but then, your allies will start serving a minimal purpose. So I would avoid using standard frontline characters, unless you are really experienced and are good at controlling positioning.

Level 1 - Character Creation

This section covers the creation screen and what would go into the best Races, Abilities, and Skills for the Storm Acuity Sorcerer build. If you have already started playing, feel free to do a respec at Withers and follow along. This will make it easy to follow the build step by step.

Races

Picking a race provides various benefits - abilities, dialogue options, looks, etc.

Race	Features	Description
High Half-Elf	Civil Militia Darkvision​ Fey Ancestry	Comes with a selection of additional cantrips and shield proficiency. Overall good benefits
Dwarf Duergar	Dwarven Combat Training​ Superior Darkvision​ Dwarven Resilience​ Duergar Resilience​	Ridiculously powerful race choice if you want to abuse the level 5 Invisibility​ + Minor Illusion​ to pull up targets into one place.
Wood Half-Elf	Civil Militia Darkvision​ Fey Ancestry Fleet of Foot - your movement speed is increased by 1.5m.	The extra movement speed is always a nice option. Moreover, as the build does want to go into melee range and use Booming Blade​ + Metamagic: Extended Spell, I highly value this feature
Wood Elf	Elven Weapon Training​ Darkvision​ Fey Ancestry Fleet of Foot - your movement speed is increased by 1.5m.
Githyanki	Martial Prodigy​	A very versatile race that unlocks good features for combat and exploration. Githyanky also come with medium armour proficiency, enabling them to wear more armour options early on.
Blue Dragonborn	Lightning Breath​ Draconic Ancestry​	Although the race is somewhat disappointing, it still fits the theme pretty well, as it represents lightning elements.
Bronze Dragonborn	Lightning Breath​ Draconic Ancestry​
Halfling	Halfling Luck Brave	General good race, with multiple rerolls helping to avoid failing various checks, spells and saving throws.
Deep Gnome	Gnome Cunning​ Superior Darkvision​ Stone Camouflage​	With a general Advantage to mental checks with Gnome Cunning, it's easy to resist deadly spells.

Class Choices

Class

Overview
Sorcerer
Features
Spell Slots	These can be used to cast spells and are restored each long rest.

Cantrips

Cantrips	Description
Ray of Frost​	Your long-range cantrip for the early game.
Minor Illusion​	It can be used to distract NPCs, even before combat or pull them together into one place. One of the most powerful actions in the game.
Friends​	If you are the main character and do most of the dialogue, this is mandatory as it gives an Advantage on dialogue rolls. Be careful to not cancel it near the NPCs, as they will attack you.
Shocking Grasp​	A very useful melee range spell, that allows to disable enemy reactions. It also works well with metamagic, enabling various effects.

Spells

Spell	Description
Magic Missile​	A good spell to have in the arsenal, in the early game, as it has a 100% hit chance and is perfect for eliminating specific targets. The missiles can target enemies that you cannot see.
Mage Armour​	Easily guarantees 13 Armour Class while wearing robes. With 16 Dexterity, this will result in 16 Armour Class, on par with Heavy armour users. Later on, you will have light and medium armour options, so the spell loses its value.

Subclass

Overview
Storm Sorcery
Features
Tempestuous Magic​	After you cast a Level 1 spell or higher, you can Fly as a bonus action until the end of your turn without receiving Opportunity Attacks.

Background

Backgrounds serve a few purposes:

1. They give a role-playing option of your previous history, if you are into that.
2. It gives skill proficiencies, meaning that you get an additional bonus when you roll that skill check in which you are proficient. This depends on your proficiency bonus, which increases as you level up.

Here are my recommendations based on this build

Abilities

Now, let's take a look at the abilities of the Storm Acuity Sorcerer build. Correct allocation will allow you to maximise the early gameplay and get good modifier bonuses.

Skill Proficiencies

Overall, skill selection should be influenced by your role-playing and background decisions. However, you generally still want options that offer the best benefits. I recommend picking skills for which you have a high ability modifier or those that are useful in general:

• Deception
• Intimidation
• Persuasion

Act 1 - Levels 2-6 - Wilderness

By this time, you should have landed on the Ravaged beach already and started exploring the initial area. You might need 1 additional encounter if you did not obtain enough XP in the Nautiloid.

Leveling Progression

Level 2 - Sorcerer Lv 2

Here are the main features that you get from the class at this level:

Actions	Description
Create Sorcery Points​	Spend Spell Slots to gain Sorcery Points. Once you get some more metamagic options, you could sacrifice spell slots to cast two spells in one turn or increase your range.
Create Spell Slot​	Spend Sorcery Points to unlock a Spell Slot. You could create a higher-tier spell slot to increase the damage over what you can at the current level

Here is what you should pick for this level:

Selection	Description
Spells: Shield​	Excellent defensive spell, greatly improving survivability with +5 armour class.
Metamagic: Metamagic: Extended Spell​ Metamagic: Twinned Spell​	These are special Sorcerer actions, giving specific improvements to spell. Spells that only target 1 creature can target an additional creature. This is great on spells like Chromatic Orb, Command​ and others. Extend also works interestingly with something like Gloves of Battlemage's Power + Booming Blade,​ giving double Arcane Acuity. So overall, this is a pretty powerful choice.
Replace Spell: -	-

Stacking Sorcery Points

The main point that you will want to utilise from Sorcerer is Sorcery Points. They play a big role in the whole combat loop and allow you to utilise Metamagic (I will cover its options in the next section).

The points can be pretty limited if you heavily utilize them. You can work around this by using Create Sorcery Points​ and consuming spell slots. They are important for spellcasting, so using all of them is quite expensive for Sorcery Points. However, 2 items in particular give free spell slots:

• Pearl of Power Amulet - restores up to a level 3 spell slot, so 3 sorcery points
• Spellcrux Amulet - allows restoring up to a level 6 spell slot, but Create Sorcery Points​ only works max on a level 5 spell slot.

So with these, you can get 8 Sorcery points every long rest, which is substantial and can help you use something like Metamagic: Quickened Spell​ or Metamagic: Extended Spell​ multiple times per long rest.

Of course, you can go crazy and use Potion of Angelic Reprieve, which allows you to restore level 1-2 spell slots, where you can end up with 20 or even more sorcery points. This is kind of a glitch, so I leave this to your discretion.

Metamagic

This one is pretty important and is the main feature that allows sorcerers to stand out from other casters. At first, you get two metamagic options, and as you progress 2 more will be available. Let me cover their main usages:

• Metamagic: Twinned Spell - this one can be very powerful, especially if used correctly, with weaker spells. For example, in the early game, you can twin Chromatic Orb which gives a huge damage boost for a very cheap cost. Same for other spells, like Haste or Blindness. The major caveat is the Act 3 staff Markoheshkir. When activating Bolts of Doom you can twin Chain Lightning, specifically from this weapon.
• Metamagic: Extended Spell - is another very powerful tool. First, some encounters might be longer so extending spells like Command, Hypnotic Pattern or others is beneficial. However, it also has interesting interactions with Booming Blade + Gloves of Battlemage's Power where you can double the amound of Arcane Acuity stacks.
• Metamagic: Quickened Spell - gives the ability to cast a full spell with a bonus action. This means you can cast very powerful spell options and greatly increase your damage and combat potential for the cost of 3 sorcery points.

Level 3 - Sorcerer Lv 3

Now here are the choices:

Selection	Description
Spells: Cloud of Daggers​	This can be used to target multiple enemies and is very good in passages or choke points. The spell deals damage when it's cast and when the enemy's turn begins. This means you do 2x damage by default.
Metamagic: Metamagic: Quickened Spell​	By consuming 3 Sorcery points, a spell can be cast using a bonus action instead of an action points. You can cast two damage spells, one after another. Or cast a control spell followed by an offensive one. This opens a lot of possibilities to combine various spells.
Replace Spell: -	-

Level 4 - Sorcerer Lv 4

Selection	Description
Cantrips: Booming Blade​	This will be one of your main cantrips later on and will enable high Arcane Acuity​ stacking.
Spells: Chromatic Orb​	This baby will be very useful in various situations throughout the game. It can be cast with different elements and will activate item effects.
Replace Spell: -	-
Feat: Dual Wielder​ Ability Improvement - +2 Charisma	The Dual Wielder​ allows wearing Melf's First Staff + The Spellsparkler or Phalar Aluve + The Spellsparkler. These are powerful combos that make the core of the build in Act 1. If any of these items are limited or carried by others, take the Ability Improvement.

Level 5 - Sorcerer Lv 5

Level 3 spells are unlocked

Selection	Description
Spells: Lightning Bolt​	The core spell of this build that you will use during most of the encounters. I will cover how to maximize the damage with it in the mechanics section. Overall, just make sure to use it on Wet​ enemies to maximise lightning damage.
Replace Spell: -	-

Level 6 - Sorcerer Lv 6

The new features from class and subclass:

Features	Description
Heart of the Storm​	A powerful free feature that activates without much effort. It has various interesting mechanics riding on it, and can even help you build Arcane Acuity​ stacks.
Heart of the Storm: Resistance​	You are resistant to Lightning and Thunder damage.
Create or Destroy Water​	I would say this is one of the main reasons to go with Storm Sorcerer. It means you don't have to multiclass to get the spell, and it allows for neat combos like electrified water and double damage with lightning spells on Wet​ targets.
Call Lightning​	A perfect skill to hit multiple enemies that are close to each other. Also, it can be reused next turns without expending spell slots if your concentration is not broken. However, it will break other spell concentration
Sleet Storm​	Amazing crowd control spell that disrupts spellcaster concentration and creates Ice surfaces. After one turn this changes into water. It can be electrified or wet enemies can be hit for double damage.
Gust of Wind​	Creates a wide cone of wind that pushes enemies 5 meters and throws them off balance. I use Thunderwave, which also deals damage.
Thunderwave​	It allows you to knock back targets and deal thunder damage.

Level Selection:

Selection	Description
Spells: Fear​	A very powerful spell, especially against a group of enemies that are using weapons.
Replace Spell: Cloud of Daggers​ -> Counterspell​	Can be a lifesaver against enemy casters in case they will be able to cast a powerful spell.

Applying wet for serious damage

As a Storm-themed sorcerer, your goal is to hit enemies with huge amounts of damage. This is generally achieved when targeting enemies that have a Wet​ condition. There are a few ways to apply it:

• Have someone cast Create Water​ (generally, clerics and druids can do this from level 1)
• Throw a Water, or drop it near the enemy and destroy it using offhand attack when wearing Hand Crossbow +1.
• Cast Create Water​ yourself when you have reached level 6 Storm Sorcerer.

Having an enemy with Wet​ condition doubles your damage with lightning and cold spells, and in many cases, can one-shot multiple enemies. This is one of the core things to understand about this build, and it will become crazier as you progress.

Gear Recommendations

Gameplay and mechanics

Minor Illusion to divert enemies

On the other hand, you can also use something like Minor Illusion​ to pull enemies together, change their vision cones, and attack with the same spell but hit all of them. This is a very powerful cantrip that can be overlooked.

First, it does not break Invisibility or stealth (unless you get seen). Second, enemies when not in combat will chase it, meaning they will change their vision direction. Third, on most occasions, they will come closer to investigate the illusion.

This creates various opportunities like landing a powerful Area of Effect spell from caster or scrolls, or hitting with wide attacks.

The recommended combat loop

• Magic Missile​ is one of the best picks for early games. You get a 100% hit chance and get bonus damage via The Spellsparkler + Psychic Spark.
• Shield​ is perfect for avoiding early-game wipes. Just make sure to have a free level 1 spell slot to activate it.
• Cast Mage Armour​ to ensure you have good Armour Class, if possible wear shield.
• You can use Metamagic: Twinned Spell​ on Chromatic Orb​to deal hefty damage. The thunder variant has 3d8, and lightning can get its damage doubled via Wet.
• Once you unlock level 2 spell slots, Cloud of Daggers​ can be used to hit enemies that are stacked together. There are a few encounters where you can hit up to 3 enemies in one turn.
• Shocking Grasp​ + Metamagic: Distant Spell​ makes the cantrip long range.
• Minor Illusion​ can be used to lure enemies into one place before combat. This works extremely well with Cloud of Daggers​ and other area-of-effect spells.
• You can do a nova round with Metamagic: Quickened Spell​ + Haste​/Potion of Speed, to unleash up to 3 spells per turn, in most scenarios, easily beating the encounter.

From level 6:

• Cast Create Water,​ and if standing on it with The Watersparkers + The Sparkswall it will trigger electrified water. For now, this is a good gimmick for a slight damage boost, later it will become one of the core rotations.
• Once you get Lightning Bolt,​ use it together with Wet​ status (Water or Create Water​) to inflict huge amounts of damage. You can even utilize Minor Illusion to get them in one place before combat starts.
• When you unlock Heart of the Storm, aim to use Lightning spells - Shocking Grasp (strangely it works even if it is a cantrip), Chromatic Orb: Lightning, etc to activate these storms. They will greatly improve your damage. If Phalar Aluve: Shriek​ is active, it will boost each interaction's damage.

Act 1 - Level 7 - Creche Y'llek

I will assume that you reach level 7 in this place, as it has plenty of stuff to explore. This also contains some significant gear that you should be on the lookout for. I will try to keep this section short, as the build does not have any major changes here.

Leveling Progression

Level 7 - Sorcerer Lv 7

Level Selection:

Selection	Description
Spells: Confusion​	Makes enemies lose control of themselves and do unexpected things. They may skip a turn, attack allies, run around, etc. This lasts for 3 turns and can be an effective way to control a large area.
Replace Spell: -	-

Gear Recommendations

There are a couple of items that I would prioritise here; otherwise, the previous Act ones are already enough

Gameplay and mechanics

No major changes here, to how you played, you can utilize Confusion​ now on a group of enemies.

Act 2 - Level 8-10 - Shadow Lands

Depending on your choices, you might even reach Act 2 at level 7, so check the previous recommendations

Leveling Progression

Level 8 - Hexblade Level 1

This is where I recommend multiclassing, as here you will most likely obtain the core items - Gloves of Battlemage's Power and Hat of Storm Scion's Power or Helmet of Arcane Acuity. You can access multiclass via the level up screen:

Here are the choices:

Selection	Description
Class: Warlock	This will be the level 1 dip which will give powerful features.
Cantrips: any	Take anything here
Subclass: Hexblade	The goal is to get Bind Hexed Weapon​ and Hex Warrior​.
Spells: Shield, Armour of Agathys​	Shield​ will replace the one from Sorcerer, enabling an additional spell option for replacement. Another spell could be Armour of Agathys, which would effectively reflect double damage on Wet​ enemies.

Bind Your weapon

This is where Hexblade comes in. You will want to use one of the melee weapons - Phalar Aluve, Cacophony, Nyrulna to hit with your weapon and activate the thunder damage rider (if using Hat of Storm Scion's Power). As a caster, your hit chance is pretty low, but you can circumvent this by using Bind Hexed Weapon​.

With this, you will use the spellcasting modifier to decide how effective your weapon is instead of dexterity or strength. This enables you to do a very powerful and cheap combo - Booming Blade​ + Metamagic: Extended Spell,​ enabling you to stack Arcane Acuity​ instantly.

I would say this is the best and easiest combo to use. After that, you can follow up with a control spell to obliterate the enemy's combat economy.

Level 9 - Sorcerer Lv 8

Continuing to level into Sorcerer. Here are the choices:

Selection	Description
Spells: Blindness​	This is a very valuable spell, as it does not use concentration and greatly weakens targets. Moreover, it can be used to chip away at the enemy's Legendary Resistance.
Replace Spell: Mage Armour​ -> Ice Storm​	Pretty good spell, gives different element option, has a wide area, and can Prone​ targets. Mage Armour​ will be less important now, as you have access to pretty good medium armours - Luminous Armour, Dark Justiciar Half-Plate, etc.
Feat: Alert​ Ability Improvement - +2 Charisma War Caster: Opportunity Spell​	Pretty good choices here. I would prioritise Alert​, especially if you will not use Hellrider Longbow on this character. Otherwise, you can improve your charisma for a higher hit chance with weapons and spell success. The War Caster: Opportunity Spell​ is a great option, as you can use Shocking Grasp​ during the enemy's turn on an attack of opportunity to activate Heart of the Storm. Moreover, it will give a constitution saving throw Advantage if you are not using items like Dark Justiciar Half-Plate.

Level 10 - Sorcerer Lv 9

Selection	Description
Spells: Hold Monster​	It can be used to paralyse the strongest enemies in the game. This immobilises them and opens them up for critical hits from close range.
Replace Spell:-	-

Gear Recommendations

The goal here is to obtain one core item - Gloves of Battlemage's Power. This then enables you to follow the gear recommendations. Hat of Storm Scion's Power is also a nice addition, which I will explain briefly later.

For medium armors you can start wearing them once you get the Hexblade multiclass.

Gameplay and mechanics

This is an important section, as the build gains major changes in how it plays, thanks to various unlocked items.

Activating Electrified Water

Now this is where things get interesting. You can have yourself or an ally cast Create Water + Metamagic: Extended Spell​ (if you need 6 turns duration). I recommend upcasting to level 4, as this covers a huge area, which should reach you and enemies. With The Watersparkers + The Sparkswall, you will turn this into electrified water and apply Electrocuted on enemies.

That's a nice combo, but it gets very powerful once the enemies are Wet​:

• If you have Callous Glow Ring equipped, enemies nearby will get +2 damage on each tick
• If Lightning Charges​ or Phalar Aluve: Shriek​ is active, additional thudner and lightning will be added
• If you have Gloves of Battlemage's Power equipped, each damage tick on enemies will give +2 Arcane Acuity. So you get better Spell Save DC during enemy's turn.​
• If you have Hat of Storm Scion's Power and Phalar Aluve: Shriek,​ this will give +2 Arcane Acuity more on each activation​

As you can see, not only can you deal additional damage to enemies on their turn, but you also buff yourself for the next round for a higher spell success chance.

Stacking Arcane Acuity

So what makes this build special is that, as a lightning caster, you will still be able to have a very high Spell Save DC and easily apply control spells. So you are the best of both worlds - a powerful nova nuker and an ultimate controller. Here are some easy ways to build Arcane Acuity​:

• Cast Metamagic: Twinned Spell​ + Chromatic Orb: Thunder​ for 4 Arcane Acuity​
• Attack with Booming Blade​ + Metamagic: Extended Spell​ + Hat of Storm Scion's Power + Gloves of Battlemage's Power + Thunder Rider (Cacophony, Phalar Aluve: Shriek​ or Nyrulna) - 8 Arcane Acuity​ (this is my recommended option)
• Metamagic: Extended Spell​ + Chromatic Orb: Lightning​ - 4 Arcane Acuity​

The options greatly open up if you have Phalar Aluve: Shriek. Now, with each damage interaction, it will activate Hat of Storm Scion's Power. This can get pretty ridiculous - by using Shocking Grasp,​ you activate small storms with Heart of the Storm,​ and each of those activates thunder damage, which activates your hat. I guess you can see where this is going.

Luminous Armor importance

The build can reach its ultimate form with Luminous Armour + Callous Glow Ring. With each hit, you will apply Radiating Orb​ that lowers enemy attack rolls, making it very hard for them to hit you. It also has strange effects with Arcane Acuity, where it activates more stacks from the various interactions that I mentioned before. Still, there are caveats:

• If using electrified waters, this will damage your allies and apply Radiating Orb​ on them... So the utility of the armour greatly diminishes. 
• This armour is in great demand, especially by Cleric Builds

Still, if you plan your party around this - long-range archers, casters, throwers, you can avoid the interaction with electrified water. So I leave this decision to you.

Combat Loop

Once you have the core gear - Gloves of Battlemage's Power and, optionally, Hat of Storm Scion's Power, you can now start creating mayhem. Here are the recommended steps.

You have two main choices for how to start the combat. For example, if you see a group of pretty mid enemies:

1. Cast Minor Illusion, to clump enemies together (you can be invisible)
2. Cast Create Water (add Metamagic: Extended Spell​ for longer duration), this should enter combat. If not, you can enter turn-based mode
3. Now you can cast a lightning spell like Lightning Bolt​ to land a huge burst of damage round

Of course, if you know a fight that will be harder, or are not sure how to approach, you can then stack Arcane Acuity​:

1. Make sure to bind your weapon with Bind Hexed Weapon​ so that you can use Charisma as your main attacking stat.
2. I recommend using Booming Blade​ + Metamagic: Extended Spell​ + Cacophony/Phalar Aluve: Shriek​ to hit an enemy and get instantly 8 stacks of Arcane Acuity. If you have a low hit chance, you can do Chromatic Orb: Thunder​ + Metamagic: Twinned Spell​ for a long-range option.
3. Follow up with a control spell like Confusion, Fear, etc., to disable enemies. This should have almost a guaranteed landing, disabling most of the enemies.
4. If you can, cast Create Water​ to create an electrified surface, which will help you build Arcane Acuity​ on the enemy's turn
5. Or you can just wait, use something like Shocking Grasp​ or let your allies kill enemies one by one.
6. Or finish them off with a banger spell like Lightning Bolt​

If you have Luminous Armour:

• Make sure to have Light​ on yourself to activate Callous Glow Ring
• Have precast Phalar Aluve: Shriek
• Start the fight with Create Water​ on the group that you plan to fight or are fighting, so that the water gets electrified
• Use Metamagic: Extended Spell​ +  Shocking Grasp​ to build Arcane Acuity​
• You can now either cast control or offensive spells with a high success chance.

So the combat approaches revolve around a few things - build Arcane Acuity​ and create electrified water, which helps to maintain spell save DC, applies Wet and debuffs enemies with Radiating Orb.

Act 3 - Level 11-12 - Rivington and Lower City

Leveling Progression

Level 11 - Sorcerer Lv 10

Selection	Description
Cantrips: anything	Take any of the options that you might find useful
Spells: Hold Person​ Dimension Door​ Hypnotic Pattern​ Telekinesis​	Here, you have various choices for the spells. Choose what you think is most useful for the type of combat you are running.
Metamagic: Metamagic: Distant Spell​ Metamagic: Heightened Spell​	Metamagic: Distant Spell​ can be used to turn Shocking Grasp​ into a long-range spell, making it a free lightning option. The heightened option makes it easier to land some spells, but I would say the difference is negligible.
Replace Spell:-	-

Level 12 - Sorcerer Lv 11

This is the last level, which unlocks level 6 spells. You also unlock additional features:

Features	Description
Storm's Fury​	Gives protection against melee-range enemies that dare to attack you. It's an alternative use of Reaction to Shield​ and Shocking Grasp​ from War Caster: Opportunity Spell.

And selection options:

Selection	Description
Spells: Chain Lightning​	This is a mandatory pick as it enables you to hit 4 times or 4 enemies. With Wet​ status applied this can win an encounter in one turn.
Replace Spell: Shield​ -> Globe of Invulnerability​	This is not necessary if you are extensively using scrolls, but otherwise, I recommend having this spell. It can be a lifesaver in certain situations, making you invincible to damage.

That's it! The build is done with full progression and various recommendations.

Gear Recommendations

This will unlock a few better items, but overall, the core of the setup will not change much.

Gameplay and mechanics

In general, Act 3 does not bring much in terms of how the gameplay changes. It's just optimisations to your gear and higher-level spell unlocks

Utilising spell Scrolls effectively

In Act 3, you should already be stocked up on plenty of scrolls. If not, I recommend checking the Pickpocket Guide on how to get those easily, as the late game rewards you with them. These allow you to save spell choices - Chain Lightning, Globe of Invulnerability, Confusion, etc and also save spell slots.

Combat Loop

• Be sure to activate Kereska's Favour​ from Markoheshkir - Bolts of Doom​ or Bone-Shaking Thunder. These will give free spells to cast and additional improvements.
• Bind your Nyrulna with Bind Hexed Weapon​. Use it as the main source of Arcane Acuity​ using - Booming Blade​ + Metamagic: Extended Spell​ to get 8 stacks of the buff.
• Nyrulna allows for Zephyr Flash,​ which can help build Arcane Acuity​ from medium distance if you have Hat of Storm Scion's Power equipped. 
• Electrified water is a powerful source of maintaining Arcane Acuity​ through the enemy's turn.
• If using Phalar Aluve precast the Phalar Aluve: Shriek to get thunder damage rider on all of your damage sources.
• Use Scrolls!

Maximising - Abilities, Illithid, and Consumables

Maximising Ability Scores

Now, as the build progression is covered, there are a few aspects and important decisions you will have to make throughout the game. These will decide your final score for abilities.

Charisma

1. 17 Charisma - the base for character creation.
2. Act 1 - Auntie Ethel's Hair - you will want to get +1 Charisma if you pick this choice.
3. Feat- Ability Improvement - +2 Charisma.
4. Act 3 - Mirror of Loss - pick +2 Charisma.
5. Act 3 - Mirror of Loss - Patriar's Memory, additional +1 Charisma, to counteract Auntie Ethel's Hair if it was skipped in Act 1.

These will allow you to reach 22 natural Charisma, depending on the various choices. This results in a +6 spellcasting modifier and improved Spell Save DC.

Illithid Powers

This special mechanic in Baldur's Gate 3 allows you to consume tadpoles and unlock special Illithid Powers.

At first, you can only use the base powers. As you move to Act 3, you will be able to unlock the outer ring powers, also called Elite.

Illithid Power	Type	Description
Favourable Beginnings	Base	Beneficial power to take as it does not have any costs, and provides only benefits on the first hits with attack rolls.
Luck of the Far Realms​	Base	An easy way to ensure you land critical hits.
Cull the Weak​	Base	Can help to kill an enemy faster if it is left with a few HP.
Psionic Backlash​​	Base	A great way to weaponize your reaction before obtaining Counterspell.
Shield of Thralls​	Base	Excellent option for bonus temporary HP. It can also apply Stunned on foes after it is destroyed.
Illithid Expertise​	Elite	Can be used to maximize the effectiveness of charisma-based skills, especially relevant to the main character.
Black Hole​	Elite	Very powerful spell that can be used to pull enemies together. You can then follow up with area-of-effect spells or attacks. In general, it is a very effective action in the hands of any character.
Psionic Dominance​	Elite	Can be used to save yourself from a deadly spell. This is especially relevant as you will have a Disadvantage on mental saving throws.
Freecast​	Elite	Remove the cost of spell slots or charges.
Mind Sanctuary​	Elite	You can now use action and bonus action interchangeably, giving two full spell casts each turn. It's not as important for you, but it will help other casters in the group.

Potions, Elixirs and other Consumables

Let's take a look at what consumables you can use to further empower the build.

Potions

These are general consumables, and most of them are activated for a few turns. Potions are separate from Elixirs and can be active together.

Consumable	Description
Potion of Speed	This is a very powerful potion. It gives an additional action point, which can be used to cast a spell or attack. The activation is generally by drinking using a bonus action. However, you can stack together with party members and make one member Throw​ it on the ground, giving Hastened​ to everyone.
Potion of Invisibility	It can be used in two ways - the first one is to enter combat with a Surprised​ round, causing enemies to skip their turn. Another option is to leave combat if you see that it is not going in your favour.
Potion of Animal Speaking	An easy way to get the Speak with Animals​ effect.
Terazul	Gives Hastened​ and stacks with other sources of it. This is a late-game consumable.

Elixirs

Unfortunately, only one Elixir can be active at a time. However, the good thing is that they last until a long rest, making them very useful and economical.

Be sure to activate them before combat as otherwise, you will need to use Bonus Action.

Consumable	Description
Elixir of Bloodlust	The elixir gives an easy option to get an additional action point - just kill a foe. This can then be used to attack one more time or cast a full spell.
Elixir of Battlemage's Power	Improves Spell Save DC, making it easier to land spells.
Elixir of Peerless Focus	Makes it easier to maintain spell Concentration
Elixir of Vigilance	For some encounters, you will want to go first. This elixir will ensure that it overcomes even Surprised​ mechanics.

Conclusion

Thank you for reading the Storm Acuity Sorcerer Build for Baldur's Gate 3. The build offers a powerful caster build that can control all wind, thunder, and lightning effects. Storm Sorcery also gives improved mobility and great reactions for dealing slightly more damage.

Cheers!

Credits

• Grousedrum - for the Acuity Storm build and sharing many insights on how the mechanics work
• C4b - took inspiration from his new build layout, and thanks for his review
• David - for reviewing and feedback on the layout