Army of Darkness

The Army of Decay is a monsterous army made purely of dark magic. Only a posseser of the Dragon Fire or something as strong as it can summon it with its spell. toward the end of season 1 the Trix stole the Dragon Fire from Bloom and used it to summon the army and destroy Red Fountain. When the Trix were defeated the entire army vanished before everyones eyes because Icy, Darcy, and Stormy no longer had the strength to command it.