Devil Guard

Description
Devil Guard was a city on Sosaria that had become totally enclosed by the mountains after Ultima I, and was only reachable via Moongate. In Ultima III, Devil Guard was one of the few places on the mainland with an available Thieves Guild.

The inhabitants of Devil Guard knew a lot about the Marks. They told the Stranger a lot about them: that there were four, and each had a different use; that they could be gained in dungeons after touching hot metal. They also suggested that there was a Mark of Kings, useful with Lord British, and that the Mark of the Snake would help bypass the Great Earth Serpent. They also told the Stranger to find the Dungeon of Fire.

Afer Exodus' defeat, the cataclysm changed the land, and Devil Guard was destroyed.