[quote=@BCTheEntity]
[@Specter189] Uh. You're going to have to explain what you mean by that. I can't say I've heard that term before.
[/quote]

Mr. Spiritual Liege's best idea evar. He saw that whole "Horus Heresy" business go down, and after getting utterly embarassed by Lorgar, decided in his infinite wisdom as a great champion that all spess muhrenes look up to:

To marshal all his forces at Macragge and establish what basically amounted to a second Imperium, with him as its leader. Instead of, y'know, go help daddy

https://1d4chan.org/wiki/Imperium_Secundus