Elixir of Enduring

Description
Brewing elixirs is a dangerous, often fatal pursuit. The wrong combination of ingredients is poisonous, or worse. The larger problem, however, is that apothecaries are loathe to share their secrets with one another, for fear of losing their business advantage. Which means that each and every practitioner has their own specific set of recipes for creating a desired effect.

This elixir fills the imbiber with unflinching optimism. This means that they become absolutely certain that they can succeed in their endeavor and they will endure anything to get their task done. Which is useful - right up until they pass out from exhaustion.