Books like The Tower Broken

The world is at breaking point. The nothing, a terrible darkness caused by the festering wounds of a god, bleeds out the very essence of all, of stone, silk - and souls. Emperor Sarmin thought he had stopped it, but it is spreading towards his city, Cerana - and he is powerless to halt the destruction. Even as Cerana fills with refugees, the Yrkmen armies arrive with conquest in mind, but they offer to spare Sarmin's people if they will convert to the Mogyrk faith. Time is running out for Sarmin and his wife, Mesema: the Mage's Tower is cracked; the last mage, sent to find a mysterious pattern-worker in the desert, has vanished; and Sarmin believes his kidnapped brother Daveed still has a part to play. The walls are crumbling around them . . .