The Orb of Xoriat (Eberron)

A world torn by generations of war . . . Xoriat, the realm of madness, a plane of existence far beyond mortal comprehension. The last time Xoriat touched the world, years of warfare and death erupted. Unspeakable terrors and vile monsters wandered free until the Gatekeepers managed to close the passage to Xoriat. But a new portal to the Realm of Madness has been found -- a fabled orb, long thought lost. In the final days of the Last War, the Orb of Xoriat was used only once. Now it has been stolen. The Orb of Xoriat continues the story line in the Eberron series that focuses on war-torn souls who have known nothing but a world in chaos. This is the second book in the War-Torn series, following The Crimson Talisman. In the aftermath of the Last War, Teron, a monk trained for war, is the last of his Order. Now he is on a quest to find a powerful weapon that might set the world at war again.