Agnus' Raging Burst

You shout out a cursed word, and energy surrounds you in a 15-foot-radius sphere.
All creatures within that area must make a Wisdom saving throw, taking 4d8 psychic damage on a failed save, or half as much damage on a successful one.
You then gain an amount of temporary hit points equal to the damage you dealt. These temporary hit points fade away after the end of your next turn.

When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.