K-Machines — Damien Broderick

August Seebeck is a 20-something student from a world not quite the same as ours. In GODPLAYERS, August tumbled into a vastly larger universe, and learned that he wasn't, after all, an orphaned only child. He and his turbulent siblings, and the breathtaking Lune and others still stranger, are Players in the Contest of Worlds. They are mysteriously transformed humans whose ancient task is enigmatic battle with the dread, passionate K-Machines. Now crisis deepens.

Empowered with a potent killing device of his own, an eerie gift from legend, August finds himself flung from world to world in a brutal and baffling game, with entire universes at stake and very little idea of the rules. Only two things are clear: his beloved Lune is not who she seems, and August's pivotal role is no chance accident. In this cosmos, survival of the gods themselves depends upon human victory over the K-Machines.