Prerequisite: 3rd level Monk or Warlock

As a bonus action you can imbue a bladed weapon with a vile power by expending either a key point or a spell slot in order to make your weapon do an extra 3d6 Poison, Cold, lightning,or Psychic damage. You can expend more key points or a higher level spell slot in order to increase the amount of d6's added to the damage. 2 key points or a second level spell slot results in 4d6 damage. 3 key points or a 3rd level spell  results in 5d6 damage and so on. The damage your weapon does lasts until the end of your next turn.