Tomb of Levistus

You entomb a creature in a frozen prison. Target one creature of your choice within range. That creature must make a Dexterity saving throw. On a failed save, that creature takes 14d6 cold damage and is entombed in ice. On a successful save, the creature takes half as much damage and is not entombed.

While entombed, the creature is restrained, incapacitated, and immune to all damage and effects originating outside of the tomb. At the start of each of its turns, the entombed creature takes 4d6 cold damage.

The ice tomb has 200 hit points and is immune to all damage except fire damage. This spell ends on a creature if the tomb is destroyed. If this spell ends early, the tomb melts away and the creature is free.

If you maintain concentration on this spell for the entire duration of the spell, the tomb becomes permanent, and the entombed creature can only be freed when the tomb is destroyed.

At Higher Levels. If you cast this spell using a spell slot of 8th level or higher, the initial damage from the spell increases by 2d6 and the hit points of the tomb increases by 100 for each level above 7th.