Few non-Lunars have ever dared explore the experimental landscape of Lunar mythology. Most celestial cults are reluctant to look into the shadows, and the Earth cults rarely look up into the sky. Maybe some of those Water cults might take a back route there along the path of the Blue Moon, but who cares about merfolk!
But if I was going to hazard who might be willing to do that – I have two candidates. The more intrepid Darkness cults like Subere are comfortable in the deepest darkness of the Underworld and might be able to find some of those same paths. Heck, might know some of them better than She does. So if I were the Red Emperor I’d be cautiously wary of the trolls as much as I despise them as vile digijelm.
The other candidate would be a god famed for assembling a band of misfits and then forging a path through the deepest Underworld to its very bottom. One who was willing to get lost, to lose everything, in order to find the right path through the deepest darkness of the Underworld and then unite others to defeat the God of Chaos. One whose defining Quest is so very similar to that of the Red Goddess herself that it might be that his quest be uncomfortably near the source of Her power? Yes, I would keep on eye on that one as well.