>>171834
>The Warp
basically the way 40k factions use to travel, see it as the hyperspace in star wars, but they spend way more time there and it also can corrupt people and make they go crazy
>Realm of Chaos
the place where Chaos Gods and their followers make their home inside The Warp
>Big E
The Emperor of Mankind
>Horus
once a loyal warmaster for the imperium, but he got fatally wounded and got sent to a temple to heal, but also to get corrupted by Chaos and betray the Imperium
>Erebus
the guy responsible for Horus' corruption, ever since his first appareance he's planting some seeds of doubt in Horus's head to get him to betray the Imperium
>the other names
All victims of Horus