Bit of a fix-up this, as short stories and novellas are stitched together to chart the rise and rise of Labienus as he plots across millennia to overthrow his human masters, defeat his immortal rivals, and commit lots of germ-based genocide. It's chilling and horrifying, bit also funny and warm and clever. I quite like it when the books skip across time like this, plot threads and characters weaving in and out, gives it a great sense of epic scale and impending crisis.