THE MURREN MOORS
This is a Tunnels and Trolls adventure in the Castle Calahony series.
You hand Amnihur the flower you found. He boils it, mumbles a spell and pours it into a vial. The vial contains a liquid which will boost dexterity with 1d6. This raise is permanent. However, every character can take this liquid only once. The second dose is deadly. You may, however, sell it to the characters of other players. The vial contains sufficient quantity for 1 application only.
Now go to sleep and start the next day fresh.