I dunno, if anything I would think the 40k Chaos Gods would technically be on the heroes' side- the Chaos Gods want mortals in their thrall to toy with for eternity, whereas Surtur et. al. want to unmake the universe entirely. Whether or not anyone would *want* to accept their help is another matter. Also, I would suspect Zoner would probably have an Icon of You Bitches Work For Me, like Horus did.