A Ghost ÄRM said to be the most dangerous of the Ghost ÄRM. It merges the user with a serpentine monster. Hydra eliminates the memories of its user, and it cannot be used by anyone still considered human. The mouth can fire a powerful beam of magical power. It was used by Chimera, but the ÄRM rejected her because her memories of her lover Marco maintained her humanity. Hydra was destroyed by Ian’s guardian, Peryton.