Mortia

Mortia, is the most southwestern part of the dual continent. Once a thriving place, now a desert. The only way that one could ever go into Mortia, was the Onorico Pass that went directly through the Oronian Mountains.

Life Source - The Mountain King
Just the same way as in Orinheim. Gilban has placed a Mountain King inside of the Mount Egna turning it into a large fountain, which would spread the life giving water across the land of Mortia. It was a land of Peace and prosperity. The Mountain King has been died during the Big Bang Cataclysm

The illusionary Welfare
Even after the Great Seal, with all the Tyadi flowing into the world, it seemed to have stayed intact. Back then, nobody understood that the Tyadi must be present in some region, in some form. Nearly no monsters evolved from animals living in Mortia. Artemis, a scholar from United Mage Association's, brought out a thesis that the entire Tyadi energy might be accumulating the same way the White Pearls have been forming. In year 853 he wrote a dissertation "The Black Pearl", where he stated that just the way as the Tyadi Gemstones can form in the same crystalic form as the Saeli stone, the Black Pearls must exist. No one wanted to believe, believe they existed. For they have been forming deep in the Halyut Mines where noone has ever been. The first black Pearl has been discovered after nearly a five hundred years, by the year 1248, the Black Pearl Deposits have been reached. They have still been scattered between the Saeli Pearls, hence the excavation hasn't been stopped. Despite multiple precautions, that mining an unstable and deadly element is hazardous, the greed of the Halyut people won because the lower they went, the bigger the pearls have been. In year 1250, two years after the black pearl discovery, the Halyut people have uncovered a black pearl, of an unimaginable size. Over one meter in it's diameter. They have commited the worst mistake of their lives - they have decided to take the large crystals out of the mine. Most mages fled from the city, being afraid of the power, lurking inside of the gemstone. Nobody knows what really happened, but the gem has unleashed it's entire energy. The enormous ammount of Tyadi has corrupted the entire Mortia. The King of Mount Egna has been killed which has stopped the water flow.