various
Dark Angels: the Story So Far

Catch up with the Lion and his warriors with this collection of tales from the Great Crusade and Horus Heresy that chart the evolution of the primarch and Legion as they choose a side in the war.
The Horus Heresy
collection

It contains:
Master of the First
Fallen Angels
The Lion
Descent of Angels
By the Lion's Command
Savage Weapons
The Unremembered Empire