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S01E10a Toenails

Fresh Toenails

Human Toenails are the currency of the monster world.

As such, they are referenced heavily throughout the series, but feature more heavily in some episodes.

Cold Hard Toenails Ickis becomes wealthy after finding a wealthy shut-in with a closet full of toenail clippings

Lifestyles of the Rich and Scary it is revealed that Oblina's family's wealth comes from their house being build under a pedicuria