Antithaumites

Antithaumites are black green sludge monsters with an infinite immunity to magic. Though they can use magic, they are actually made of antimagic, an antimatter variant of magic made of antimana, quantumized antimatter, capable of negating or destroying magic. These monsters are found in realms of pure mana, and they possess a hatred for magic. They were capable of shapeshifting, could survive in any environment, and were completely numb to all magic spells.