Mordenkainen's Lost Notebook
4-level Transmutation
You or a creature you touch while casting the spell take the form of a winter wolf (MM, p340). In addition, the target gains 20 temporary hit points, which if unused disappear at the end of the spell’s duration. The transformation lasts for the duration, or until the target drops to 0 hit points or dies. When it reverts to its normal form, the creature returns to the number of hit points it had before it transformed. If it reverts as a result of dropping to 0 hit points, any excess damage carries over to its normal form. As long as the excess damage doesn’t reduce the creature’s normal form to 0 hit points, it isn’t knocked unconscious. The creature is limited in the actions it can perform by the nature of its wolf form, and it can’t speak, cast spells, or take any other action that requires hands or speech. The target’s gear melds into the wolf form. The creature can’t activate, use, wield, or otherwise benefit from any of its equipment.