Crimson Moon (Home Brew)

Using an incredible amount of firepower, the user creates a huge fireball from inside his opponent that is strong enough to defeat a Demon Infernal; creating an explosion which resembles a red moon. NOTE: This spell should not be used often or else the user will develop Tephrosis.

This spell has two parts to it, the first being an unarmed spell attack. On a hit, the target takes 5d10 bludgeoning damage. Then they must make a con save. On a failure the target takes 10d12 fire damage that overcomes any fire resistance or half as much on a success. After the damage is done, the user takes a level of exhaustion.