Ultima Underworld: The Stygian Abyss

You are the Avatar, noblest of heroes. In your day, you have beheld many wonders and proved yourself master of many dungeons. But nothing in your experience prepared you for this — the terror-filled passages of Britannia's underworld. Many years have passed since your last visit to Britannia. Little did you expect that, when you returned, you would be accused of kidnapping Baron Almric's daughter, Arial — and then be thrown into the Great Stygian Abyss, without so much as a chance to prove your innocence.