Midnight Tides (The Malazan Book of the Fallen 5)

After decades of warfare, the five tribes of the Tiste Edur are united under the implacable rule of the Warlock King of the Hiroth. But the price of peace is a pact with a hidden power whose motives may be deadly. To the south, the expansionist kingdom of Lether has devoured all lesser neighbors - except the Tiste Edur.