Glacial Cascade

8th-level evocation (winter)

Casting Time: 1 action
Range: Self (30-foot-radius sphere)
Components: V, S, M (a piece of alexandrite)
Duration: Instantaneous

By harnessing the power of ice and frost, you emanate pure cold, filling a 30-foot-radius sphere. Creatures other than you in the sphere take 10d8 cold damage, or half as much damage with a successful Constitution saving throw. A creature killed by this spell is transformed into ice, leaving behind no trace of its original body.