To escape Xanthe's trap in The Blood of Dawnwalker during the siege of Griefberg Castle, players must follow these steps:
1. Confront and defeat the enemies in the main chamber.
2. Proceed through the door directly ahead and to the left.
3. Pull back the bookcase to reveal a hidden hole and descend into it.
4. Return to the main room, eliminate any remaining foes, and find the door with the triangular, downward-pointing, tentacled-eye banner.
5. Drop down through this door.
This process should be repeated until the player successfully escapes the trap.