Amaterasu

You create a 20-foot-radius Sphere black and red flames centered on a point within range. The Flames lasts for the duration or until dispelled.

Each creature in the Sphere makes a Constitution saving throw, taking 2d8 Fire damage on a failed save or half as much damage on a successful one. A creature must also make this save when the Sphere moves into its space and when it enters the Sphere or ends its turn there. A creature makes this save only once per turn.

The Sphere follows the target until dispelled or duration ends.

can be dispelled by dispel magic or remove curse.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 5.