Ultima Underworld: The Stygian Abyss

The Isle of the Avatar was discovered during the Fourth Age (as described in Quest of the Avatar), at the height of the Avatar's quest. The stranger from another world, who came to Britannia at Lord British's call, passed the test of the eight virtues and became the Avatar - the embodiment of the pure axiom of life. During his travels, the Avatar discovered a terrifying artifact: the skull of Mondain the Evil, the first of the Triad of Evil. There were those who claimed that the artifact had the power to destroy all life on our world. Fortunately, it was the Stranger who discovered it, and not someone of lesser virtue. After completing the Path of Eight Virtues, the Avatar set out to find the Codex of Supreme Wisdom. Legend connects this ancient tome with the underground labyrinth known as the Great Stygian Abyss. "Truly, no one has ever explored its depths," wrote Shamino, who obtained a map of the passages through magic. "I cannot imagine the horrors that await the first who ventures into the Stygian depths.