various
Angron

The primarch of the XIIth Legion, the feared gladiator-king Angron, is a force of nature, a warrior whose fame is built on bloody slaughter. And his future holds even more, as he falls to worship of the Ruinous Powers...
The Horus Heresy
anthology

It contains:
After Desh'ea
Butcher's Nails
Lord of the Red Sands

Also in:
The Horus Heresy: Nine Traitor Primarchs