Activation Requirement: The Mangekyō Sharingan feat must be activated to use Amaterasu.

Casting: Choose a target within sight and expend 4 Chakra points to cast Amaterasu. Chakra can be paid with ki or health points.

Saving Throw: The target must make a Dexterity saving throw.

Damage: On a failed save, the target takes 1d8 + your spellcasting ability modifier fire damage. On a successful save, the target avoids direct contact with the flames by removing affected clothing or objects. Half damage is taken on a successful save the flames don't persist on target.

Persistence: Amaterasu persists until removed or until the target is reduced to ash. The flames cannot be extinguished by conventional means but can be removed by sealing or by removing affected clothing or body parts.

Subsequent Damage: At the start of each of the target's turns while affected, it takes an additional 1d8 fire damage.