Icy Grave

4th-level abjuration

Casting Time: 1 action
Range: 100 feet
Components: V, S, M (a miniature glass cage)
Duration: 1 hour

You create a magical prison of ice that wraps itself around the target, temporarily freezing them in place. The target must succeed in a Wisdom save, or be bound by the spell. If it successfully saves, then it is immune to further castings of the spell by you for a long rest. The icy prison has 150 hit points and can only be affected by bludgeoning damage. Furthermore, if damage is inflicted on the prison, the victim will take 25% of the damage. Once the duration of the spell expires, it takes four hours for the ice to thaw naturally. Heat can be applied to the ice in the form of campfires, torches, and the like, and it will reduce the thawing time by 50%. Magical fire applied to the icy prison will reduce the thawing time by 75%. When the victim is finally free they gain 3 levels of exhaustion which can be alleviated by a long rest.