Arcane Champion

Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.

Arcane Empowerment. When you attack with a weapon you are proficient with, you can use the stat increased by this feat, instead of Strength or Dexterity modifier, for the attack and damage rolls.

Arcane Champion. On your turn, when you score a critical hit or reduce an enemy to 0 hit points with this weapon you can cast a free 1st level spell with a casting time of 1 action as a bonus action. (This must be a spell you know)