Ultima Underworld II: Labyrinth of Worlds

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Ultima Underworld II: Labyrinth of Worlds is the second and final game in the Ultima Underworld series. The game uses a more advanced first person 3D engine the Ultima Underworld: The Stygian Abyss.
One year after the events of Ultima VII: The Black Gate, Lord British holds a feast at his castle for the Avatar and the Britannian Council. The following morning the Guardian causes a great blackrock dome to cover the entire castle, trapping all within. The Avatar must travel to eight other worlds already controlled by the Guardian to free the castle from the Guardian's trap.