A Poisonous Potion

From the introduction:

When designing a RPG campaign, scenario or adventure, it’s the task of the GM to come up with unique situations for the participants to battle or problem solve their way out. However, there are many different types of problem solving skills the GM can require from the participants. This puzzle was specifically designed to be incorporated within a RPG and to provide the players with an opportunity to solve an in-game puzzle that is woven into the story. The statistics have been intentionally left out so that it might be used in any number of systems...