Anti-life

When you cast this spell as an action you choose a 30ft cube within 50ft of you. You flood this area with necrotic energy and pure emptiness, all creatures who are in the area when the spell is casted take 15d12 necrotic damage and whenever a creature begins their turn in this cube they take the damage or half as much on a successful wisdom save. If a creature fails the saving throw two times in a row they are incapacitated, stunned, and prone until they are forcefully moved out of the area. This spell immediately ends once you lose concentration on the spell.