The Asutra (Durdane, #3)

From the furthest borders of the Durdane, strange rumours are spreading. For in Caraz's land of exiles and murderers, deeds are being done more terrible than any of its most ruthless dwellers could commit. And so it is to the mountains of Caraz that Gastel Etzwane must turn, certain in his heart that his old foe is not yet finished. And sure enough, amidst the rocky wastes there moves a menace whose horror the men of Durdane can scarce imagine. For as Gastel Etzwane has long since guessed, their enemy, the monstrous Asutra, is simply not of their world...