This poison is given to the Protagonist by Lord Khellon Menold, and only if the player character is of evil alignment, during the Animal Trouble in Trademeet quest. It can be used in the Druid Grove (building) area (AR1901, [1052.401]).
Note that, if used, the druids will all become hostile. In addition to this, Cernd—if he is in the party—will leave and also attack the player character.
|“||This is the poison given to you by Lord Khellon. He suggests that you find the holy font of the druid grove and pour the poison into it so that the druids will be weakened and easy to kill.||”|