Arcane Blade

Your mastery of magic and swordsmanship has allowed you to augment your weapon attacks using your arcane ability. You gain the following benefits:

• Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.
• 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.
• On your turn, when you score a critical hit or reduce an enemy to 0 hit points with this weapon you can cast a 1st level spell with a casting time of 1 action as a bonus action. (You can up-cast this spell but it must be a 1st level spell you know).