Drusilla

Drusilla is one of three suspicious female monks encountered by the Avatar in the era of Serpent's Fang (the other two being Solaria and Rieya). She can be found in Ultima VII Part Two offering 'helpful' advice to the Avatar outside Issik's Maze.

Description
It is revealed at the end of the quest for the Silver Seed that all three are in fact working for the Guardian, and have been sent by him to prevent the Avatar from restoring the Tree of Balance.

Drusilla, along with her sisters, was killed by the Avatar and party when they attempted to stop this restoration.

Trivia

 * She is the only one who doesn't lie to the Avatar, as far as the advice is concerned.