Malumor

Malumor (or the Island of Demons) is a "demonic sanctuary" created by Absentius Uredos during the second 
Ancient War. It is visitable by the Sailing skill, after its initial discovery by the Golden Oculus. 130 Sailing is required to visit the island, though players can obtain an "essence" from the Oculus to visit the island for a short period of 15 minutes, if they do not have the skill.
The island is home to several elites and rare elite creatures. Their drops play a part in building Reliquiae, the Unknown Gift, and the story helps to understand Absentius' grand scheme.