Entomb

You choose a creature within range to magically construct a coffin around, shutting them inside with overlaying chains. The target must make a CON Save. On a failure, it is locked inside, stabbed with a thousand blades, and magically dealt 5d12 Piercing damage. The coffin turns to ash at the start of its next turn. The creature has total cover while the spell lasts and can't move or escape by any means other than teleporting. On a success, the creature takes half as much damage and the coffin immediately fades. An undead that has advantage on saving throws against or is immune to effects that turn undead has disadvantage on its saving throw against this spell