Eisenhorn

Gregor Eisenhorn is an Inquisitor in the Warhammer 40,000 universe, hunting heretics, aliens and daemons across the Imperium of Man - and slowly, over a career of more than a century, coming to use the very powers he swore to destroy. Dan Abnett's trilogy Xenos, Malleus and Hereticus follows his descent; The Magos, published in 2018, adds a later novel alongside the Eisenhorn short stories. Eisenhorn's former pupil carries the story on in the Ravenor trilogy.