Sister Antos

Sister Antos is a wise druidess who can be found in the castle of Serpent's Hold during Ultima IV.

Description
One of three mystics with the surname Antos, Sister Antos' relationship to Brother and Father Antos is not explicitly stated, although all members of the triad offered similar aid in assisting the Stranger with lore of the three artifacts of the  Principles needed to enter the Abyss.

After having been advised by Zorin to seek the aid of the Antoses, the aspiring hero could ask Sister Antos about the Bell of Courage - upon which she would direct them to the fighter Garam, who could tell the Stranger where the instrument lay, deep beneath the sea.

Trivia

 * In the Nintendo port of Ultima IV, Sister Antos tells the Stranger where the Bell of Courage is directly, instead of referring them to another character.