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

Will-o’-the-wisp

will-o’-the-wisp [wil ə ðə ˈwisp] noun, c.1660; means “Will of the wisp” from the masculine proper name William + wisp, a bundle of straw used as a torch; also will-o-wisp, foolish fire, chir batti, hinkypunk, pixy-light, corpse light.

1. Denizen of the Clockpunk Wizard world.
2. A malicious sentient magical creature that lives in fens and marshes. It consolidates the rotting magic from decaying plant and animal matter, and burns the fouled magic with a weak light. It craves living flesh, and a group of will-o’-the-wisps can strip a living animal to the bone within minutes. Wizards and sorceresses can counter a will-o’-the-wisp’s appetite by giving it a small metal object soaked with human magic.
3. Personages: The hungry sisters in the Murphy (“Wrong”) Swamp on Hurt Isle in Ephraim’s Curious Device.
4. See “Will o’ the Wisp: Swamp Siren (Part 1)” and “Will o’ the Wisp: Swamp Siren (Part 2)”