Phoenix is a thief living in the sewers beneath Castle Britannia. In Ultima VI, the Avatar had to join the Guild of Thieves and the guild master wanted to throw out Phoenix, as she had been too successful, which was bad for business. So the Avatar searched for her to steal her membership belt. Seeing that she was far better armed (Magic Armour and Glass Swords), the Avatar used the Pickpocket spell to steal her belt in secret and then left her alone.