various
The Battle For Tallarn

The Iron Warriors came from nowhere, falling upon the world of Tallarn in a flash and devastating it with deadly virus weapons. A verdant world was transformed in a heartbeat into a radioactive wasteland... but that was only the beginning.
The Horus Heresy
collection

It contains:
Tallarn: Siren
Tallarn: Executioner
Tallarn: Witness
The Eagle's Talon
Tallarn: Ironclad
Iron Corpses
Black Oculus