Lemuria

Lemuria was a continent on Earth that was submerged after a war with Atlantis over Orichalcum.

History
In 150,081 CMT, Zev Raregroove explained that, in ancient times, Lemuria was a continent-sized nation that used raw Orichalcum in their works. Atlantis went to war with Lemuria over control of the magical metal, which led to both continents becoming submerged beneath the ocean... "sort of". Zev added "It's kind of weird what happened to Atlantis and Lemuria", but decided that he would tell the rest of the story another time.

Later, Master Big Star expressed disapproval of Uterio di Armechio's recruitment of human soldiers from the League of Oblivion to the Council of the Great Beings. Master Big Star explained to the Council that, if the Great Beings continued to involve humans in their affairs, he thought that it was likely that humans would be introduced to truths of the universe that they were not yet ready to learn as a species. To further put his point across, Master Big Star reminded the Council what had happened when the human inhabitants of Atlantis and Lemuria gained knowledge that was not meant for them at that time, referring to the submergence of both continents.

Later still, Nabonidus gave the Underlord several new materials to use in his crafts, including a small pillar of special Orichalcum ore that had been pressurized beneath the sea and filled with Lemurian sorcery.