Although the Hydra is mostly depicted as a serpentine water monster, sometimes it is shown as a land creature. It was said to be an offspring of Typhon and Echidna and that it watches one entrance to the Hades: Lake Lerna.
" The alarm echoed across the city, sending any and all the populace into a blind panic. No-one knew how one of these beast got to Braeden but that didnt matter. 'Later,' swore lord Noblaise to himself. 'Later, someone's head will roll.