Armour Crunch

Take control of a piece of armour, reshaping the material to reduce it's effectiveness by half your character level. It will remain in this state until it is repaired.

If the armour is being currently worn by a creature, the creature must roll a constitution saving throw against your Spell Save DC. Upon failing, they take Force damage equal to their armour class plus your Charisma modifier. On a success, the target takes damage equal to half their AC without any modifiers.