various
Primarchs: the Ebooks Volume 1
Primarchs (series)
Roboute Guilliman. Leman Russ. Magnus the Red. These names, and fifteen others, stand as a legacy of honour, glory – and treachery. In this collection, you will return to the Great Crusade and see these heroes striving to build mankind's Imperium, before the Horus Heresy threatened to tear it all down.
The Horus Heresy
collection

It contains:
Magnus the Red: Master of Prospero
Roboute Guilliman: Lord of Ultramar
Leman Russ: the Great Wolf