Miraak - Tears Solstheim from Skyrim in a fight

The Traitor's plot was discovered by one of his contemporaries, another Dragon Priest whom legend named The Guardian. The two fought a mighty battle that lasted for days, each hurling terrible arcane energies and thu'um shouts at the other.

So great and terrible were the forces unleashed in this contest that Solstheim was torn apart from the mainland of Skyrim. Here, the myth clearly descends into the realm of pure fantasy.

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The Guardian and the Traitor