Elissa

Elissa is the resident mage of Serpent's Fang, and met by the Avatar during the quest to recover the Silver Seed. She appears to be a proficient magic-user and merchant (she's more than happy to sell the Avatar several spells for the price of Gold Coins). She also offers the Avatar magical training for a price, which makes her the only magic trainer in the game.

It has been speculated that Petra is the automaton reincarnation of Elissa, as they both appear very similar, although if this is the case, she doesn't indicate any memory of her former life during the War of Imbalance.