Warhammer 40K's lore is riddled with warfare among factions. Which of the many sides of the conflict are the most powerful?

Lurking in the alleyways of towering hive-cities and crawling through abandoned industrial complexes, the Genestealer Cults ...

Goatboy here with what we need to see coming for the other Chaos Cult Legion codexes, World Eaters, Thousand Sons, & Death ...