Supernatural canines such as Werewolves, Werecoyotes and even Kitsunes can be weakened by exposure to letharia vulpina, otherwise known as "wolf lichen" because of it's toxic effects toward the canine species, it is unknown how they would effect a Lowenmensch, Kanima or Werejaguar considering that at least the last two are known to come from the same "gene".

The plant was weaponized by Alan Deaton as a way to temporarily stop a powerful Nogitsune, a void Kitsune that had possessed Stiles Stilinski.

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