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The Mausoleum is the ancient area that is guarded at the entrance by the powerful undead dragon Rotscale. The mausoleum houses the remains of many nobles of the past, and many powerful undead roam the area, protecting their rest.
The Mausoleum is accessed by speaking to the Enter the Mausoleum NPC in Majesty's Rest. This NPC is located on top of the "Bone Dragon Isle" behind Rotscale.