The Bestiarum Vocabulum is the wizard’s encyclopedia of faerie beasties and mundane crossovers living in the lake and forest near Lita’s castle.

Hydra

hydra [hahy druh] noun, c.1350; L < Gr hýdrā < ME ydre < MFr; also sea snake, water serpent.

1. Denizen of the Clockpunk Wizard world.
2. A magical sentient creature that lives in freshwater lakes and marshes. It has nine heads atop long sinuous necks, and a barrel-shaped body with front flippers and webbed hind feet. The hydra’s primary magic is the ability to regrow its severed heads. Hydrae are immune to enchantments. Wizards can kill a hydra by burning all nine neck stumps with mundane acid before the replacement heads sprout.
3. Personages: Sir Death’s ferryman in Old Bony Blue Eyes.
4. See “Old Bony Blue Eyes Book Trailer”