Cryogenic Prison

Ice erupts and begins to consume one creature you can see within range. The target must make a Dexterity saving throw. It takes 8d6 cold damage on a failed save, or half as much damage on a successful one. On a failed save, the target also freezes for the spell’s duration. The freezing target sheds bright blue light in a 10-foot radius and dim blue light for an additional 10 feet. At the end of each of its turns, the target repeats the saving throw. It takes 4d6 cold damage on a failed save, and the spell ends on a successful one. This magical ice can’t be melted by nonmagical means.

If damage from this spell kills a target, the target is permanently turned to ice with no way of bringing them back.