A long-lasting hallucinogen that is extracted from a fungus growing only on beaver pelts, Hyderdroxipine is more obscure now than it once was.

When the American frontier was still wide open, and fur traders and trappers were among the first to explore its wilds, Hyderdroxipine was better known (although not under that name – the names given to it by trappers and traders are unfortunately lost to history). However, as the demand for beaver pelts diminished, so too did the availability of the drug.

Potentially deadly in its effect, Hyderdroxipine was extracted only after the removal of its source fungus from the beaver pelt, which usually caused the fungus to become impregnated with the prussic acid used for the job. In addition, the half-life of the drug is said to be 72 hours, and only the most strong-willed of individuals are able to function well while on it. Even Batman found it difficult.