I've been playing best fantasy 4X Endless Legend again, and today I was thinking about what an MLP/Endless Legend crossover might entail. But the premise of the game -- that the planet of Augria is gradually entering a permanent ice age -- is sort of ruined if the unicorns/alicorns can control the sun and the moon.
"I am pretty sure I am misunderstanding the description, and I don't really agree with Urban Dictionary here, but here is how I interpret The Gloomer.