Kasha's Coffin

3rd-level evocation

Casting Time: 1 action

Range: 60 feet

Components: V, S, M (a charred bone)

Duration: Instantaneous

You conjure a blazing coffin of fire around a creature within range. The target must make a Dexterity saving throw. On a failed save, it takes 6d8 fire damage and becomes restrained by the fiery coffin until the start of your next turn. On a successful save, the creature takes half as much damage and is not restrained.
At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the fire damage increases by 1d8 for each slot level above 3rd.