Confused by Warhammer 40,000? Now you can learn 40K lore with Space Marine 2's lead voice actor

Beefcake shooter Space Marine 2 really dumps you into Warhammer 40,000 at the deep and spiky end. Not only does it expect you to remember the events of the previous game from 13 years ago, it also expects you to have kept up with everything that's happened to the setting in-between. Primaris marines? Rubric marines? Even for someone who reads the novels like me there's a lot to keep track of. What's the difference between a zoanthrope and a neurothrope again?

If you're coming in at the ground floor...