Midnight Tides (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.