Book: Warhammer 40k - The Horus Heresy Part 11
As you might have guessed it, this book would reveal the story of what happened to the Blood Angels Legion during the Horus Heresy. At the dawn of the mankind greatest treachery, Sanguinius have yet to suspect that his brother Horus have become a mad motherfakker. As Horus at that time hold the post of the Warmaster, he gaves the Blood Angels a subjugation duties that takes them all back to Signus system. The system was once pacified by both of the Blood Angels and Luna Wolves Legion.
Sanguinius, eager to show his brother, Horus, his love and support to the newly appointed Warmaster, took the majority of his Legion and sail to the rebelling Signus system. There were histories in that place between Sanguinius and Horus. A significant one. First, the Signus system was one ruled by a xeno species called the Nephilim. Humanoid yet as big as the Astarte, the Nephilim disguised themselves as human's savior, promising peace and serenity. The human population accepted this because, well, turns out the Nephilim kind of mind-control them, giving the illusion that they are at peace (like drugs), but the truth is the Nephilim is sucking the life out of them. The Nephilim lives through the sustenance of what they called 'adoration', or 'worship' of some kind. In return, the human that follow them would feel happy, docile, pretty much like cattles.
