Sortiarius, better known as the Planet of the Sorcerers, drifts within the tempests of the Eye of Terror, a world torn from realspace and remade by will alone. It was here that the Thousand Sons fled after the destruction of Prospero and their damnation upon the Wheel of Fate, carried into the Warp by their primarch Magnus the Red. In that maddening realm, Magnus wrought a new homeland from raw possibility, a planet that answers to thought rather than physical law.
Sortiarius is a place of towering ziggurats and crystalline spires, of librarium-fortresses whose vaults hold forbidden lore gathered across ten thousand years. Its skies churn with impossible colours and its landscapes shift according to the whims of the powerful, for here the boundary between mind and matter has dissolved entirely. The world is riven into fiefdoms ruled by the Sorcerer-Lords of the Legion's Cults, each a master of some arcane discipline, each scheming endlessly against the others.
At the heart of it all towers the fortress of Magnus himself, the greatest sorcerer of the age, whose ambition still burns for vengeance against the Imperium that damned him. From Sortiarius the sorcerous warbands sally forth through the Warp to plunder the galaxy of its secret knowledge. To walk its streets is to move through a dream made real, beautiful and terrible, where power is the only law and every shadow whispers of hidden magic.
The atlas continues
