The hydras, a once proud alien race, are now facing the threat of extinction. Well, at this point, they are about 99.9999995% of the way there. Apparently, it wasn't enough for poor Hydral to be the last survivor of his kind; he also suffered a grave injury. All that's left of him is his head, which has since been attached to an assault mech. This abomination of biomechanical engineering was locked away in a labyrinthe prison known as Megalith. Now, the only way out is through the Warden.