Be'lakor, the most powerful Daemon Prince, could potentially kill a Primarch due to his abilities. There are a lot of new and interesting Warhammer 40k factions that Games Workshop could introduce.

Yes, this is the same Primarch Tahal who completely annihilated ... As they sit there and debate how to bring it in, Moll's Breen Dreadnought arrives and snags the tech. The Discovery crew studies ...