Armageddon's Pyre

When a creature you can see within range is reduced to 0 hit points, you can offer its corpse and soul to Armageddon. You gain a level of Insanity, and each creature within 20 feet of the body that can see it must succeed on a Charisma Saving throw or gain a level of Insanity and take 10d6 Fire damage. The body is then reduced to ash and cannot be brought back to life by any means of 8'th level or lower.