Empire in black and gold - Adrian Tchaikovsky

The city states of the Lowlands have lived in peace for decades, bastions of civilization, prosperity and sophistication, protected by treaties, trade and a belief in the reasonable nature of their neighbors. But meanwhile, in far-off corners, the Wasp Empire has been devouring city after city with its highly trained armies, its machines, it killing Art . . . And now its hunger for conquest and war has become insatiable. Only the aging Stenwold Maker, spymaster, artificer and statesman, can see that the long days of peace are over. It falls upon his shoulders to open the eyes of his people, before a black-and-gold tide sweeps down over the Lowlands and burns away everything in its path. But first he must stop himself from becoming the Empire's latest victim.