necrotic empowerment

8-level Necromancy

You call upon the mother cyst that your body hosts, drawing from it strength, vigor, speed, and vicious certainty.   While the spell is in effect, you gain advantage to Dexterity, Intelligence, and Wisdom checks and saving throws, a +8 natural armor bonus to Armor Class as your skin briefly crusts and hardens, advantage on Constitution saves, and 100 temporary hit points.   While the empowerment lasts, you are unable to cast any other mother cyst feat-enabled spell.