Louvnon, from Ultima Underworld
Louvnon is a sorceress of the Seers of the Moonstone.
The Avatar met her in Ultima Underworld I on the sixth level of the Abyss. She was eager to tell the Avatar the result of her research concerning shrines and mantras. She'd gotten out that besides raising stats, the shrines could also give directions to powerful artifacts with the right mantra. However, she didn't know the mantra for that, as it had been split up into three and lost into time.
However, with the help of incense under Fyrgen's instructions, the Avatar had three visions of the Cup of Wonder with the three parts of the mantra. With it, it was possible to locate, where the cup would re-appear. Later, Garamon rescued her when the volcano erupted.