A Military Science Fiction series by David Gunn. "Aux" is short for "Auxiliaries". Namely, Sven Tveskoeg's auxiliaries, an elite squad in an elite regiment of Emperor Octo V's army. Sven himself is a Badass Abnormal Anti-Hero / Punch Clock Hero with a bad temper. Octo's glorious empire battles the Enlightened, watched by the United Free who drastically enforce The Laws and Customs of War when they feel like it.