Assume True Form

You unleash the true form of the demon inside. Until the spell ends, you can’t cast spells, and you gain the following benefits:

• You gain 50 temporary hit points. If any of these remain when the spell ends, they are lost.
• You have advantage on attack rolls that you make with simple and martial weapons.
• When you hit a target with a weapon attack, that target takes an extra 2d12 psychic damage.
• You gain a fly speed of 30 feet.
• You have proficiency in Strength and Constitution saving throws.
• You can move through creatures and objects as if they were difficult terrain You take 1d10 force damage of you end your turn inside an object.

Immediately after the spell ends, you must succeed on a DC 17 Constitution saving throw or suffer one level of exhaustion.