United Chaos (Warhammer 40000) vs Felarya's guardians

Welp, being a fan of lots of sci-fies and fantasies for it's worlds! Two worlds that I like are the world of Warhammer 40k and the world of Felarya.

I wanna know what you guys think would come out on top if united Chaos were to invade Felarya. Pick a side and state your points, with evidences and calculations if you will. Please, keep this reasonable. Both sides have full assets. Both sides are in character. Felarya may not somehow change dimensions. Both sides will be exposed to each other. The Guardians and Chaos gods may participate.