User can produce black fire from their body.

Pros:
-user can turn anything that touches the fire to ash
-user will ruin clothes of others
-fire is easy to control
-user can't control how damaging fire is
-user is not effected by fire

Cons:
-user will be driven to madness after killing 10 people
-user will be seen as a villain
-user must regulate amount of fire
-user must have small bursts of fire to prevent build up
-fire will control personality of user

Weakness: Valhalla ice
User will spiral out of control and will be replaced with a goodie-two-shoes version of themselves who will help anyone. This is broken by being punched in the face.