Eldritch Slayer (Combat)

Your spellcasting ability briefly becomes more powerful after you slay an opponent with a weapon.

Prerequisite(s): 1st-level Eldritch Knight

Benefit: Whenever one of your attacks with a melee or ranged weapon (not with a spell) causes your target to drop below 0 hit points, your caster level increases by 1 for the next spell you cast before the end of your next turn. If you bring multiple targets below 0 hit points during a round, this effect stacks with itself, increasing your caster level by 1 for each target. If you do not cast a spell before the end of your next turn, this bonus ends with no effect.