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Infernal Rapier
Infernal Rapier
Very Rare
1d8+2 Piercing
High Spellcasting: You gain a +1 bonus to Spell Save DC.
Melee Caster: Instead of its Dexterity Modifier, the affected entity add its Spellcasting Ability Modifier to Attack Rolls.
Weapon Enchantment +2
Planar Ally: CambionClass Actions
Proficiency with this weapon type unlocks:
Imagine the soul as a blade. A good one, carefully looked after. A bad one suited for rusting in the rain. Flame-chewed and narrow, this blade is Wyll's soul summarised in steel.Rapiers Finesse
Location - Infernal Rapier
Located in the 
Mind Flayer Colony. This is the later part of Act 2.
Requires Wyll to be in the party.
Possible to receive as a reward if Mizora is persuaded after completing "The Blade of Frontiers".
Discussion
Wyll MUST be in the party ( and present ) when freeing Mizora to acquire this.