Twist Life

You touch a creature, mist absorbers the creature and it must make a DC18 charisma saving throw with disadvantage . On a failed save, the target will take 5d12 necrotic damage plus the challenge rating of the creature you are trying to create and the subject will be transformed into that creature until another spell changes the creature back. On a successful save, this spell does nothing. You can also use this spell on yourself to change into that creature fo any time you want but you take 2d4-2 for each hour you are that creature.