I am pretty sure the guy who wrote Daemonculaba worked on the series Arcane by Riot. Graham McNeill is he's name. He currently works for Riot as a Narrative writer and he does freelance writing work for 40k still as well.
As a Night Lord I shall explain future sight for our legion. We tend to see the bad futures, but its only a variation of the future, which can be course corrected with some level of danger Edit: The guy who wrote the daemonculaba was the lead writer for Riot Games' Arcane.
if there is a video on those chapters that do not know from which primarch they derive , I advise you to watch it , I will give you an example : sons of the phoenix
Majorkill is heavily downplaying the scale and successes of the previous 12th black crusades. Furthermore, Abbadon recently pretty much won the Arks of Omen wars, he gathered all the artifacts to create the great key, and destroyed Indomitus Crusade Fleet Quartus, the fortress world of Malakbael, and the Choral Engine. That's just the major stuff. The dude went to war with the whole galaxy in this campaign, against ALL the factions, and achieved all his goals.