The Brittle Riders

A brilliant man hosted a party. It was such a good party that it culminated in the death of all humanity. That story is boring and oft-told. This is not that story. This is the story of what happened next. The Brittle Riders, apocalypses are funny that way.
Book I
Edward Q. Rohta was a brilliant scientist who created multiple species of slave labor. Furious at being persistently abused, they revolted. After the death of every man, woman, and child on the planet, things get a little weird.
Book II
Terror marches ever closer. Our heroes find themselves joined by new allies while facing frightening enemies. No matter the winner the result may be genocide.
Book III
Something still lives. Something that could render Arreti a wasteland. This final threat is making its push for world domination. Who will save our heroes? Who will buy them booze? Which question is more important?
Apocalypses are funny that way