Sorlock - Sorcerer Warlock Multiclass Build - Baldur's Gate 3 (BG3)

Sorlock - Sorcerer Warlock Build

Wanted to thank Frostbite from Baldur's Gate 3 Discord for the help with the build.

As the name implies this is mainly a combination of Sorcerer and Warlock. These are both caster classes that synergize well. First, both of them have the same primary attribute - Charisma. This makes them perfect party-face characters. Second, Sorcerer provides a variety of options for spellcasting and Metamagic mechanics. Warlock, on the other hand, comes with the most powerful cantrip in the game, that this build will utilize.

In the end, the build will be able to both support the group and go all in on the offense based on what the situation requires. Want to concentrate on a boss and take it out. Blast 3 Eldritch Blasts per turn and push it to the corner of the map. Want to disable enemies for a few turns? Just activate Command or Hypnotic Pattern, to leave them actionless.

Sorlock build variations

Another thing is that you can make a few setups based on the classes you pick. Here are some most important ones:

Short overview

This is a short overview and progression of the build. Use it to get a glance if you want to pick the best options without going deep into the explanations. A more detailed description with texts, suggestions, and improvements can be found in the next sections.

Sorlock leveling overview

Level	Category	Choice
1	Abilities	Str 8, Dex 16 (15+1), Con 14, Int 8, Wis 10, Cha 17 (15+2)
	Class	Sorcerer 1
	Cantrips	Friends, Minor Illusion, Fire Bolt, Light
	Spells	Magic Missiles, Chromatic Orb
	Subclass	Draconic Bloodline
2	Class	Sorcerer 2
	Spells	Thunderwave
	Class Passives	Metamagic: Twinned Spell, Metamagic: Distant Spell
3	Class	Sorcerer 3
	Spells	Scorching Ray
	Class Passives	Metamagic: Quickened Spell
4	Class	Sorcerer 4
	Cantrips	Mage Hand
	Spells	Shield
	Feat	Ability Improvement - Charisma +2
5	Class	Sorcerer 5
	Spells	Lightning Bolt or Fireball
	Replace Spell	Thunderwave -> Haste
6	Class	Warlock 1
	Subclass	The Great Old One
	Spells	Hex, Armour of Agathys
7	Class	Warlock 2
	Spells	Any spell
	Eldritch Invocations	Agonizing Blast, Repelling Blast
8	Class	Sorcerer 8
	Spells	Counterspell
9	Class	Sorcerer 7
	Spells	Ice Storm
	Replace Spell	Chromatic Orb -> Confusion
10	Class	Sorcerer 8
	Spells	Blight
	Feat	Alert  or  Dual Wielder
11	Class	Sorcerer 9
	Spells	Cone of Cold
12	Class	Sorcerer 10
	Cantrips	Blade Ward
	Spells	Telekinesis
	Class Passives	Metamagic: Heightened Spell

Starting the Game

We start with the early game. I would go into what are the best Races, Abilities, and Skills for Sorcerer Warlocks. Some of these choices are impactful as you cannot respec them.

Races

Picking a race provides various benefits - abilities, dialogue options, looks, etc. Also, keep in mind whether your picked race has Shield proficiency as this can improve survivability or give benefits for offensive.

Race	Features	Description
Halfling	Halfling Luck Brave	Although they cannot wear a shield, they are the perfect choice for builds that aim to land critical hits.
High Half-Elf	Civil Militia Dark Devotion Fey Ancestry	I think this is the "optimal" choice. High Half-Elfs get a cantrip, Darkvision, and also shield proficiency. More or less everything that you need for a good Sorcerer
Human	Civil Militia Human Versatility	This is one of the rare occasions where I would recommend going with a human. You can get Shield proficiency that will be valuable throughout the game for various bonuses and increased Armour class.

Class

We start the build with Sorcerer. First, it will give us Constitution Saving Throw proficiency. Second, we want to get level 3 spells as soon as possible. They have very powerful options like Fireball, Haste, etc. After that, you can pick Warlock.

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

Cantrips

The sorcerer gets 4 cantrips. This is a lot, allowing us to make some good choices:

Cantrips	Description
Friends	If you are the main character and do most of the dialogues, this is also a good choice as it gives an advantage during rolls.
Fire Bolt	Use this cantrip to deal moderate damage or light up barrels with oil. Perfect if you want to save spell slots. Note: Take this Fire Bolt even if you have the one from Elf or half-elf. The other scales with Intelligence and we need Charisma
Light	A very handy spell, especially in Act 2.
Minor Illusion	Lure enemies together from stealth with the cantrip. Then use Shatter, Thudnerwave, or any other area of effect spell, to deal huge damage.

Spells

Sorcerers cannot prepare spells. This means that what they choose during the level-up screen - is what they can use. This can easily cause decision paralysis especially if you are new to the game. Here are my recommendations for what to pick early:

Spells	Description
Magic Missile	I recommend this spell. It is not very powerful, but it can hit multiple enemies and does not miss. You can easily finish off a straggler with a few HP and damage the second foe. The missiles scale with higher spell slots, and are useful throughout the game.
Chromatic Orb	This is a very versatile spell, that can be used to create various surfaces and deal different elemental damage.
Mage Armour	This spell will give us 13 Armour Class. Pair this with a dexterity bonus and we have 16 Armour Class at the start of the game. The same as a heavy armor user. Moreover, getting a shield will also net 18. Only take this with Storm Sorcerer, Draconic Bloodline does not need it

Subclass

You can generally go for any subclass, here is an overview of what each does:

• Wild Magic - best for some fun gimmicks with Wild Magic Surge. However, as we will be going to 2 Warlock, we will not get the level 11 subclass feature Controlled Chaos. Without it, this option is the weakest in my opinion.
• Draconic Bloodline - This is a great option, especially if you will add something like Scorching Ray or Fireball to the mix. it also shines early in the game as get 13 base Armour Class. Moreover, Draconic Ancestry: Brass (Fire) provides bonus elemental damage at level 6. So when using Fire spells with Fire Ancestry each hit will get bonus damage based on Charisma Modifier. Something like a Scorching Ray or Fireball hitting 5 times or 5 enemies is especially action-efficient.
• Storm Sorcerer - you get an additional Fly mechanic after the spell cast. However, because your Eldritch Blast has Repelling Blast free movement has a lower impact. On the positive side you unlock bonus spells - Create Water, Call Lightning, etc.  These are very useful and allow for some sick combinations and dealing double damage with Ice and Lightning spells. This can be a perfect choice to respec later in the game, when Draconic Bloodline bonuses may not be as useful.

For this build walkthrough, I will go through the Draconic Bloodline subclass

Overview
Draconic Bloodline
Features
Draconic Resilience	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.
Draconic Resilience: Hit Points	Gain bonus maximum HP for each Sorcerer level.

Dragon Ancestor

This is a unique choice for the Draconic Bloodline subclass. It is important as a level 6 Sorcerer you will obtain a special Elemental Affinity: Damage that will increase related element damage. For this build, I would take any that has Fire. My preferred choice would be Draconic Ancestry: Brass (Fire) as it gives Sleep which can be useful early in the game.

Abilities

Now let's take a look at the abilities of the Sorlock build. Correct allocation will allow us to maximize the early gameplay and get good modifier bonuses.

Ability	Value	Description
Strength	8	We do not need strength as we will not be in close range often.
Dexterity	16 (15+1)	High dexterity will give a bonus Armour Class and higher initiative. This can be used to go first during combat encounters and take out a few enemies before they get to do anything.
Constitution	14	The constitution will give us bonus HP and increase the success of Constitution Saving Throws
Intelligence	8	Not an important stat for us
Wisdom	10	We get 10, to not get any negative modifier for Wisdom Saving Throws, as there are many of them.
Charisma	17 (15+2)	The main ability of Sorcer build. It determines our spell success, and spell difficulty. Moreover, it is used for many dialogue checks, ensuring that you can trick or persuade NPCs. If you will not use Auntie Ethel's Hair to get +1 to Charisma, set it to 16 and use those points on Wisdom.

Skills and Expertise

Overall, the skills should be impacted by your roleplaying and background decisions. However, you would still want those that will give you the best benefits. My recommendations are to pick those at which you have a high ability modifier:

• Acrobatics
• Persuasion
• Deception
• Performance
• Intimidation

Leveling Progression

Here is the detailed progression for the build to get you started. You can use it as a guideline because early games can be daunting and overwhelming. Later on, once you get the feel for the class you can start picking your options

Level 2

Instantly at level 2, we get a lot of improvements. First, the Sorcerer gets an additional level 1 spell slot, and 2 Sorcery points are added. They can be used for creating spell slots, additional spellcasting, etc.

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

Spells

My recommendation for the spells to be included in the spellbook:

Spells	Description
Thunderwave	Do you see an enemy close to the ledge? Or they are close to you? Use Thunderwave to knock them back and deal thunder damage. It can instantly kill foes that are thrown from the ledge.

Class Passives

Sorcerers get access to unique actions - metamagic. They allow to consumption of sorcery points to enhance spellcasting. New metamagic options will be unlocked as we level up as you have more and more Sorcery Points.

Passives	Description
Metamagic: Twinned Spell	Spells that only target 1 creature can target an additional creature. Later on, you can use this to apply Haste on two allies or a Command spell to disable two targets.
Metamagic: Distant Spell	Get a huge distance boost, allowing you to take out enemies before they even see you.

Level 3

We unlock the level 2 spell slots and spells. We also gain another option for metamagic, this time much better

Spells and Replace Spell

Because we get level 2 spells it gets interesting. Although there is no "all-powerful" spell at this level, there are multiple ones that are decent. I would like to recommend a few that you can pick from:

Spells	Description
Scorching Ray	Oh, baby! This spell will get very powerful as we level up. Specifically for Draconic Ancestry: Brass (Fire). For now, it is a decent one and can be used to target multiple enemies. However, from level 6, it will start wrecking foes
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.

I do not recommend replacing any spells yet, as all of them still serve a purpose.

Class Passives

We are getting another metamagic selection. The good thing is that two new options are introduced. Here is my recommendation:

Passives	Description
Metamagic: Quickened Spell	By consuming 3 Sorcery points a spell can be cast using bonus action instead of action points. You can cast two damage spells one after another. Or later, you could use Haste and then two spells at the same turn. This unlocks tactical possibilities.

Level 4

We get our first Feat selection that will greatly improve both offense and defense. The Sorcerer also unlocks another level 2 spell slot and can select an additional spell.

Cantrips

We can choose another cantrip. Nothing important here but you can get this one:

Cantrips	Description
Mage Hand	Quality of Life spell, that you can use to summon a hand. It can solve some puzzles, and pick and throw objects. It can also shove enemies from ledges.

Spells

As now you have a decent amount of spell slots getting this option makes sense:

Spells	Description
Shield	I cannot stress enough how powerful this spell is. You can use the level 1 spell slot, to increase your armour class by 5. The result is that you can avoid most of the attacks during the turn.

Feat

For the first Feat, there is nothing much to recommend. You only want to improve your ability score for a higher spell success chance and more damage

Feat	Description
Ability Improvement	Allocate 2 ability points to Charisma. This will increase the modifier by 1 resulting in higher spell success.

Level 5

And we finally reach level 3 spells. Moreover, we get 2 level 3 spell slots for upcasting.

Spells

There are a lot of good spells at this tier, so it's hard to choose what to pick. You should choose one hard hitter that will be your bread and butter for damage dealing:

Spells	Description
Fireball	A very powerful and trustworthy fire spell. You can hit enemies in a decent area of effect for 8d6 damage. With Draconic Bloodline Fire ancestry, each enemy hit will get bonus damage based on the charisma modifier
Lightning Bolt	A lightning spell that hits all enemies in a direct line. Try to get the best position possible to hit as many foes as you can. Moreover, try to wet enemies with party members for double damage. Get this for the Tempest Sorcerer subclass.

Replace Spell

Because we also unlock Haste, I would try getting it as soon as possible. I recommend removing Thunderwave, as in a few levels you will have Eldritch Blast for knockouts:

Spells	Description
Haste	A very powerful spell that gives an additional action point. In a sense, you can cast two spells. Add Metamagic: Quickened Spell, and you can cast 3 spells per turn! Adding Metamagic: Twinned Spell allows you to cast for both yourself and an ally.

Level 6 - Warlock Lv 1

This is the first dip into the Warlock multiclass. Unfortunately, we do not get the most important bonuses yet, however, it will still be helpful

Class

Overview
Warlock
Features
Warlock Spell Slots	These spell slots can be used to cast spells and refill each Short Rest.

Cantrips

We only need the Eldritch Blast cantrip. For the other choose, what you prefer.

Cantrip	Description
Eldritch Blast	One of the cornerstones of this build. We will be using Eldritch Blast to shred enemies to pieces and knock them down. It will become very powerful on the next Warlock level
Mage Hand	A utility spell, that can summon a spectral hand. It can help with puzzles and shove enemies.

Subclass

Now for subclasses, each Warlock option brings something to the table. One has more defensive capabilities, another is perfect for controlling, etc. So let's do a short overview of each of them

• The Fiend - can get temporary HP for each enemy killed - Dark One's Blessing. Moreover, another attractive option is the level 1 Command spell. It allows you to Crowd control foes without using a Concentration slot, which is very powerful. Add Metamagic: Twinned Spell for taking out two enemies
• The Great Old One - this is a more offensive option. This subclass can apply Freighten to nearby enemies with - Mortal Reminder. Because you will be releasing multiple shots per turn from Eldritch Blast or Scorching Ray, it will be easy to land a critical hit. So while you deal damage, you also can crowd control foes. Moreover, if you are going with Draconic Bloodline and Scorching Ray, this fits the theme even better.
• Archfey - gets the unique spell Faerie Fire. It can be useful to get an advantage on attacks. However, this requires concentration, meaning that you may lose something like Haste. So I do not recommend this one.

For this walkthrough, I will go with The Great Old One, as I think it fits the build a little bit better.

Overview
The Great Old One
Features
Mortal Reminder	As the build uses spells with multihits, this ensures that you can easily land critical hits and make enemies Frightened.

Spells

Spells	Description
Command	This is a very powerful spell, that we can empower with Sorcerer metamagic. Only can be selected with The Fiend subclass. It works as crowd control without the need for Concentration. Moreover, with Metamagic: Twinned Spell, you can cast it on two enemies. On the other hand Metamagic: Extended Spell increases its duration to two turns.
Hex	By using Bonus Action, you can weaken the enemy. Moreover, each hit will deal an additional 1-6 Necrotic damage on top. Use it together with Eldritch Blast and Scorching Ray for a pure boss-killer combo

If you chose The Great Old One subclass, pick whichever spell besides Hex.

Level 7 - Warlock 2

Level 2 will unlock the full potential of Eldritch Blast and we can now utilize it in combat for maximum damage. We also gain the second spell slot, which could be used to create sorcery points.

Spells

Take whatever spell you prefer, for this level we are mainly interested in Eldritch Invocations.

Spell	Description
Armour of Agathys	I recommend this defensive spell. It will give temporary HP and return cold damage to foes that attack you in melee.

Eldritch Invocations

Invocation	Description
Agonising Blast	Improves Eldritch Blast damage by including your Charisma ability modifier in the damage calculation.
Repelling Blast	Eldritch Blast now knocks back. This is very powerful as you can throw enemies from ledges. That is more or less the main reason to take the Warlock multiclass for Sorlock.

Level 8 - Sorcerer Lv 6

Reaching Level 6 Sorcerer gives bonus subclass features. For example, going as Storm SOrcere unlocks Call Lightning, Create Water, etc. Draconic Bloodline would unlock Elemental Affinity: Damage giving a bonus to elemental damage based on ancestry and charisma modifier.

Features	Description
Elemental Affinity: Damage	The ability will activate every time we use relevant elemental spells. In your case, this will be bonus Fire damage, when using Scorching Ray or Fireball.
Elemental Affinity: Resistance	Somewhat situational feature, I have not used it much as I would rather spend sorcery points on metamagic.

Spells and Replace Spell

Spell	Description
Hypnotic Pattern	An extremely good crowd-control spell should be used at the start of the combat. It will remove enemies from combat for two turns. Cast it with Metamagic: Extended Spell for a duration of 4 turns. Also, its success can be increased with Metamagic: Heightened Spell. Use it to take out enemies one by one, so it would not be canceled on all of them.
Counterspell	A powerful spell that can counter almost any spell that foe casts. Even if you don't use it often, it is good to have it as it will notify you of what enemies are casting and let you decide the next steps

Also if you are not using any spells in the current spell list, feel free to replace them

Level 9 - Sorcerer Lv 7

We finally unlock level 4 spells. These will be a great addition to the spellbook, but nothing that will have drastic changes

Spells and Replace Spell

Spell	Description
Ice Storm	I recommend having this spell. It can provide instant crowd control by applying Ice surfaces, making enemies fall. Moreover, using it on wet enemies will deal bonus damage. Another important aspect is that half of its damage comes as Bludgeoning, making it very effective against particular enemies.
Wall of Fire	A powerful spell that can be deadly in a choke point. I would not say that it is mandatory as you already have important spells that utilize Concentration. So I put it more as an option.

For replacement, it's your choice, you can pick something you want to try or discard a spell you do not use. One thing I recommend trying out for replacement:

Spell	Description
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.

Level 10 - Sorcerer Lv 8

This is a big step, as we fully unlock the potential of Eldritch Blast. From level 10 it gains 3 shots. This means you could potentially knock back three enemies from Chasm or into some detrimental effect.

Spells and Replace Spell

Pick one of the spells. Just keep in mind that your Concentration slots may be already constantly in use, so you may avoid Dominate Beast.

Spell	Description
Blight	A powerful single-target spell, it has 8d8 rolls and can one-shot most medium enemies. It's a good spell to have alternative spell damage
Dominate Beast	Take control of enemy beasts to fight on your side. Targeting someone with low Wisdom will allow you to break enemy ranks as they scramble and start fighting each other.

Feat

Feat	Description
Dual Wielder	With this, you can wear two staves at the same time. It is a perfect option for going all in on the offense. You can use something like Markoheshkir and The Spellsparkler together for additional lightning damage or Knife of the Undermountain King for a higher critical chance. I recommend this if you do not have shield proficiency.
Alert	This feat will ensure that you almost go first and with the deadly spell arsenal Sorlock will be able to take out or weaken at least a few enemies.

Level 11 - Sorcerer Lv 9

Level 5 Spells are unlocked, but more importantly, we get 1 of each spell slot for levels 4 and 5. These can be used to turn them into sorcery points or cast/upcast spells

Spells and Replace Spell

Spell	Description
Cone of Cold	A cold spell that can be used from melee range in a large cone. Make enemies wet before using it for double damage. It also freezes the wet ground.
Insect Plague	Deals 4d10 damage and makes the terrain difficult. Moreover, enemies get a Disadvantage on Perception checks. A perfect spell to control a choke point
Hold Monster	Similar to Hold Person, it allows putting monsters in place. Add a nearby melee attacker or go close with your spell for guaranteed critical hits. Use Metamagic: Twinned Spell for double effect!

Level 12 - Sorcerer Lv 10

We are at the last level of the build, and get some cool picks from level 10 Sorcerer. Moreover, we unlock an additional level 5 spell slot.

Cantrips

You are free to take any cantrip that you find useful. More or less the build has been finished, so this is just a good addition:

Cantrips	Description
Blade Ward	Reduce incoming piercing, slashing, and bludgeoning damage by half. If you are fighting against enemies that use physical attacks this in theory doubles your HP.

Spells and Replace Spell

Feel free to take any previous spell from level 9 Sorcerer, if you want to include it in the build. Otherwise, I can recommend trying this one:

Spell	Description
Telekinesis	I love this spell. First thing it allows you to play with enemies and throw them around the battlefield. Second, it can be recast without using a spell slot, which is another huge benefit. However, it requires a concentration slot.

Class Passives

Passives	Description
Metamagic: Heightened Spell	Targets of spells that require Saving Throws have a Disadvantage on their first Saving Throw. It will give a higher chance of spell success. But overall, at this point in the game, it will not matter much.

Illithid Powers

This is a special mechanic in Baldur's Gate 3, that allows you to consume tadpoles and unlock special Illithid Powers. These range from somewhat useful, to extremely deadly. I would like to leave a few recommendations:

Base Illithid Powers

Order	Illithid Power	Description
1	Favourable Beginnings	Very useful power to take as it does not have any costs, and provides only benefits on the first hits.
2	Luck of the Far Realms	Guarantees a critical hit, a very powerful action to have.
3	Transfuse Health	Taking only for progression, to unlock the next power.
4	Perilous Stakes	This can be extremely powerful if used correctly. Target a boss or other stronger enemy and delete them in one turn with your party.
5	Force Tunnel	Taking only for progression, to unlock the next power.
6	Displace	Taking only for progression, to unlock the next power.
7	Shield of Thralls	Taking for progression, to unlock the next power, but it also provides a good bonus as temporary health.

Elite Illithid Powers

These become unlocked later in the game as you progress. They are extremely powerful additions to the build.

Order	Illithid Power	Description
1	Freecast	Removes any cost of spell slots or charges, allowing you to cast some very powerful spells in case you cannot do that
2	Black Hole	Take full control of a group of enemies and suck them into one place. After this you can follow up with area of effect spell like Lightning Bolt or Fireball.

General Tips

Now I would like to cover some general tips on how to play Sorlock Build.

Dual Wielding or One-Handed with a Shield

This is an important aspect of this build as you can go both ways. The general rule of thumb would be that if race does not have Shield proficiency go with dual wielding. This will give an edge in offensive spell casting by giving good bonuses or increasing attack roll success.

However, shields can also be a good option, especially if other group members have equipped the most powerful items. Moreover, the bonus Armour Class is a great addition to survivability.

Auntie Ethel's Hair and Mirror of Loss

During your playthrough you will have two major points in the game, where you can increase the ability points in this case - Charisma:

1. Act 1 - Auntie Ethel, by sparing her life and getting her hair. This can be used to increase Charisma by 1. This is the reason why we leave it at 17 so that in Act 1 we could have it at 18 (or 20 with Feat)
2. Mirror of Loss. This also provides bonus ability points based on your decisions. It gives +2 to Charisma, but with specific choices, this can be +3. Overall the result should be 24 Charisma (maximum) if you also equip Birthright.

Use Spell slots to create Sorcery Points

Once you expend your Sorcerer Spell slots, you still have Warlock ones. They can be used to cast spells, but more importantly, you can use them to make Sorcery Points. For example, using constant Eldritch Blasts will easily drain them with Metamagic: Quickened Spell.

Moreover, a level 1 or 2 spell slot is mostly useless in the late game (although keep one level 1 spell slot for Shield spell). So use them as fuel to restore your Sorcery Points via the Create Sorcery Points action.  Then use these to continue multiple casts with Metamagic: Quickened Spell​ or improve success rates via Metamagic: Heightened Spell​ in late game fights.

Attacks with Damage Riders - Hex, Lightning Charges, etc.

When using multihit attacks like Scorching Ray and Eldritch Blast, be sure to utilize Damage Riders. These are bonus damage effects that go with the main damage source. The perfect example of this is The Spellsparkler which can be obtained in Act 1, in Waukeen's Rest. The staff gives bonus lightning charges for each time a cantrip hits. In addition, include Hex and you get some good damage per single target

Later you can also get Markoheshkir and dual-wield it together with The Spellsparkler for double the amount of lightning charges. So if you are fighting a strong enemy, be sure to use Hex on them, as this will provide a ton of additional damage. There are more damage sources like this - Phalar Aluve, Callous Glow Ring, etc.

Twinned Spell and Haste

Even if you did not plan this, Sorcerer can be extremely powerful support. At level 5 you gain access to level 3 spell slots and Haste. This spell gives 2 action points per turn, meaning you could double your damage output.

To do this you need to activate Metamagic: Twinned Spell and then cast Haste. You can now target two targets. I recommend doing this on yourself and another group member. This way two members in your party have double amount of actions. This will make your combat encounters much easier.

Use metamagic to empower your first turn

You can use the Metamagic mechanic to create some powerful spell combos. My favorite would be Metamagic: Quickened Spell. It allows casting a spell via bonus action. Moreover, you can use Metamagic: Heightened Spell to create a disadvantage on Saving Throws on enemies. This means your spells have a much higher chance of success. Here are some good combos:

• Cast Haste on yourself and then cast two spells on the first turn and three on the second by using Metamagic: Quickened Spell. Or have an ally apply it on you via Darkfire Shortbow for instant multiple casts on the first turn.
• Activate Metamagic: Heightened Spell and use Hypnotic Patterns, Fear, and Confusion to debilitate and fully control groups of enemies.
• Hold Person or Monster, and then cast spells for guaranteed critical hits.

Switch from Draconic Bloodline to Storm Sorcerer

One of the things that I would recommend trying late in the game (level 7+) is respeccing for Storm Sorcerer. Previously Draconic Bloodline ancestry buffs would work with Lightning Charges for bonus damage. Now this has been fixed. So the build uses Fire ancestry to improve Fire spells. Of course, Fireball and Scorching Ray are truly powerful spells, but in Act 3 things may change or you may want some fresh take on the build.

Getting Storm Sorcerer will give bonus spells (most notably Create Water) at level 6 and some positioning advantage with the Fly spell. However, all of this depends on how heavily you are using Fire spells to exploit bonus damage from Draconic Ancestry: Brass (Fire).

This also becomes more important once you get Markoheshkir and activate Kereska's Favour for Bolts of Doom. These will allow casting Chain Lightning (one of the most powerful spells in the game) with Lightning Bolt. So by using Create Water, you can double the damage these spells do.

Equipment Recommendations

Now I would like to go through some gear recommendations to maximize the Sorlock build effectiveness. Items are especially important as they take the build to the next level thanks to their unique effects.

One-Handed Weapons

There are two main approaches that you can get. One is increasing Critical chances, another is getting Lightning Charges. Because you will hit multiple times, Critical Chance is very useful. So I will also include its recommendations.

Weapon	Act	Description
Markoheshkir (BiS)	3	The most powerful stave in the game. You can imbue it with different elements - fire, for bonus fire damage, lightning - for higher lightning charge generation. So if going all in on Eldritch Blast, set Bolts of Doom.
Rhapsody (BiS)	3	The unique effect that gives +1 damage for each Scarlet Remittance stack, can be activated by destroying, tables, barrels, etc. The effect is a good damage rider. This makes it a very powerful alternative for the build to be used in the offhand.  However, this weapon will probably be in very high demand to other characters in the build.
Bloodthirst	3	A perfect choice in case you want additional critical chances and other options are taken by other characters
Staff of Spell Power	3	Gives a bonus to Spell Attack Rolls and Spell Save DC. Also allows casting a spell without using a spell slot per long rest. You can also get Dual Wielder feat and use this together with Markoheshkir. But it is outclassed in my opinion by The Spellsparkler and Rhapsody.
Knife of the Undermountain King	2	You can try this dagger as a variation to The Spellsparkler and gain a bonus critical chance. Due to the multiple hits you do, this can be a good alternative.
The Spellsparkler	1	A perfect match for multihit spells like Scorching Ray and Eldritch Blast. Each hit generates Lightning Charges that later detonate for bonus lightning damage. This staff should also support you in Act 2.
Melf's First Staff	1	Gives +1 to spell attack rolls or DC. An alternative to The Spellsparkler in case it is used by someone else.

Ranged Weapons

These weapons can be used to hit enemies from a distance. Moreover, their status effects also apply if not using them but are equipped.

Weapon	Act	Description
The Dead Shot (BiS)	3	Decreases the roll requirement for Critical Hit by 1. This is very useful even if you do not use the ranged attacks.
Darkfire Shortbow	2	Gives some elemental resistances, but more importantly Haste spell, without using any spell slots
Bow of Awareness	1	Very useful early in the game as it will make your turns earlier

Shields

What if you want additional survivability and have Shield Proficiency? You can go with Shields. Overall, multiple options give some edge in survivability. But for better spellcasting, there is only one choice.

Shields	Act	Description
Shield of Shielding	3	Allows casting Shield as a reaction, giving a bonus layer of protection.
Ketheric's Shield (BiS)	2	The only shield that improves the Spell Difficulty class and attack rolls.
Adamantine Shield	1	Provides a substantial defensive boost by reducing critical hit damage.

Helmet

There are a wide array of options that you can choose from for this equipment slot.

Helmet	Act	Description
Birthright (BiS)	3	I think this is the best choice as it gives higher Charisma and allows reaching the maximum of 24 if you take the Ability Improvement, Mirror of Loss, and Auntie Ethel's Hair. This will maximize spell success chance and damage.
Sarevok's Horned Helmet	3	Increases critical chance and stacks with other items, a worthwhile choice if Birthright is taken.
Hood of the Weave	3	Provides +2 to spell attack rolls leading to higher hit chance and overall better damage output.
Hat of the Sharp Caster	3	Improves damage output by rerolling low damage rolls.
Fistbreaker Helm	2	The best choice in Act 2 for any caster. Gives bonus initiative and Spell Save Difficulty Counter.
Covert Cowl	2	Increases the chance of a critical hit. This only works while obscured, which can be activated by standing in dark areas. (Use Shift to see if the area is obscured)
Dark Justiciar Helmet	2	Critical hit fishing helmet activates if obscured - staying in dim places.
Marksmanship Hat	2	Improves attack rolls, making more successful spell attacks. Overall, if you do not care about critical hits, this is the way to go.
The Shadespell Circlet	1	Increases Spell Save Difficulty Counter, while obscured. Very easy to activate, use Shift, to see the sun icon, it should be half or full empty.
The Lifebringer	1	The best defensive option in Act 1. Works extremely well with The Spellsparkler. Without it, the item loses its purpose.

Cloak

Cloak	Act	Description
Cloak of the Weave (BiS)	3	This is the best cloak for this build as it gives a direct boost to attack rolls. The result is more successful spells.
Shade-Slayer Cloak	3	Alternative option, that boosts critical chance. The caveat is that you have to attack from hiding for this to activate, which sometimes can be complicated.
Cloak of Displacement	3	Improves the chances of attacks missing the wearer until getting hit for that turn.
Cloak of Protection	2	Improves survivability and Saving Throw success.

Armour

Armour	Act	Description
Robe of the Weave	3	A very good overall robe that improves spell effectiveness and success rate.
Armour of Landfall	3	Gives advantages to Constitution Saving Throws, increases Spell Save Difficulty Counter, and an additional spell.
Potent Robe (BiS)	2	The best Robe for this build as it empowers Eldritch Blast with bonus Charisma modifiers. The only downside is that it requires specific choices to obtain.
Robe of Exquisite Focus	2	A decent choice, but only take it if The Protecty Sparkswall is equipped by someone else.
The Protecty Sparkswall	1	Works well with The Spellsparkler for additional bonuses to Armour Class and Saving Throws with Lightning Charges. The best choice in Act 1.

Gloves

Gloves	Act	Description
Spellmight Gloves (BiS)	3	The best gloves for any spellcaster. The downside is that they give penalties to attack rolls, but these should be negated either by higher ground or obtaining Advantage.
Helldusk Gloves	3	Another option in case Spellmight Gloves are in use, that gives a bonus to attack rolls.
Bracers of Defence	1	Gives whooping +2 Armouc Class. This is the perfect option especially if you do not have shield proficiency.
Gloves of Missile Snaring	1	Defensive gloves that allow to negate enemy ranged attack.

Footwear

Unfortunately, none of the boots provide any direct damage improvements, so they are mostly based on their utility. Another aspect is that they have no armour class so even Act 1 items can be useful.

Boots	Act	Description
Helldusk Boots	3	These boots have a wide array of uses - allowing succeeding Saving Throws while using Reaction, a teleportation spell, and ignoring difficult terrain.
Bonespike Boots (BiS)	3	Optimal choice if you are wearing a robe and go all in on the dual wielding, this way you get bonus armor class.
Evasive Shoes	2	Gives armor class an increase. Best choice if you are using Shield
Vital Conduit Boots	1/2	Because you will be casting spells with Concentration often these Boots will give an additional survivability boost.
Disintegrating Night Walkers	1	Avoids slipping on various terrains and most importantly unlocks Misty Step each short rest.

Necklace

Amulets	Act	Description
Amulet of the Devout (BiS)	3	Gives whooping +2 Spell Save DC. However, this item will be a contender for any other caster builds in the group, specifically clerics.
Magic Amulet	3	In case you do not have Risky Ring, this is a good option to gain an Advantage on important spellcasting.
Spineshudder Amulet	2	An awesome amulet that allows applying Reverbation with Each spell attack. This will reduce the success of some Saving Throws. I would say this is the second-best amulet for this build.
Surgeon's Subjugation Amulet	2	Very interesting choice. Because the build will deal a decent amount of critical hits, this will allow it to paralyze many humanoid enemies. Give this one a try.
Amulet of Misty Step	1	A decent choice early in the game as the Misty Step spell can be a lifesaver.

Rings

Rings	Act	Description
Killer's Sweetheart (BiS)	2	One of the best rings in the game, guaranteeing a critical hit. Of course, this is can be used by any build so be sure to look at alternatives.
Risky Ring (BiS)	2	Very powerful ring that is perfect for caster class staying in the backlines. The guaranteed advantage does wonders for offense. However, the disadvantage of saving throws can be detrimental. So be careful.
Coruscation Ring	2	A better option than Callous Glow Ring in my opinion. It is fairly easy to cast any light spell on yourself or have an ally do that.
Callous Glow Ring	2	Can be used to weaken illuminated enemies with Radiant Orbs.
Eversight Ring	2	As a ranged caster you want to avoid being Blind at all costs.
Ring of Twilight	2	Because it is easy to be obscured this allows to gain bonus armour class. Very useful in Act 2.
Ring of Protection	1	Gives defensive bonuses to Armour Class and Saving Throws.
Crusher's Ring	1	Increases movement speed, allowing to reach higher positions.

Conclusion

Thank you for reading the Sorlock - Warlock and Sorcerer multiclass build for Baldur's Gate 3. We went through the progression of the build, what spells to take, and how to best utilize everything that both of these classes bring.

The build is very versatile and can spam Eldritch Blast, Fire spells, and crowd-control groups of enemies.

Cheers!