You forget Imperial fists and blood angels and such, also its just a thought, adding extra mechanics, more animations, thunder armor, etc, it would be amazing.

UM weren't even on Terra. Neither were the Orks, or Eldar. It'd be a poor add-on to this game, it'd divide players between ''then'' and ''now'' and it'd exclude half of the races.

An awesome idea, elsewhere, but not here.

I know I was just joking man calm down ultras had hardly any affect on the heresy because Horus sent some of his bruthas to slow them down. But yea I mean what about people who like eldar and orks ? I'm not saying I wouldn't mind being a space marine but kinda don't want to since dark angels also had little involvement same with my other favriote chapter the salamanders. ( now notices I like a lot of green things in 40k orks ,dark angels ,salamanders and gauss weapons ) but I guess I would play it but it would be slightly inconsiderate to the other two races but I guess for orks instances PvE against adpetus custodes objective kill three of them.

EDIT: an black crusade campaign on the other hand is definitely a good idea everyone gets to join the party chaos cuz it's their campaign (duh ). SPHESS MAHREENS because they have to curbstomp chaos it's their job. Eldar cause mysterious reasons and because they want to stop chaos and orks are here just for the fighting and the lolz