I thought I had made a post on this card, but apparently I haven't. Maybe I made it elsewhere and got confused.
The current mechanical direction of green is that it's full of fungus that infects other creatures and turns them into fungus as well. At first, I really liked this idea, and while I do think it has potential, I feel that it's playing out too similarly to green mechanically, and I would rather revamp green so that it can stand on its own.
My current concept of green is different from my original one, but not vastly. Instead of fungus, perhaps green is a place where all of the creatures are plants, or are fused with plants. This temporarily presented a problem, since the story rests on the idea that Aer has been unaware of the life below it due to the sea of clouds that separates Aer from the world below. If this cloudcover is so dense that the Aerans couldn't even perceive a whole world existed below them, then how could plants survive? Wouldn't they be lacking sunlight?
Problems breed creativity, I suppose. After I came to this realization, I took to calling the "world below" the Gloaming, due to its dim nature. The light in the Gloaming emanates from the Green slice, where they worship a solar god, a great stag that holds a sun in its antlers (alternately, this could also take the form of a tree with the sun in its branches, but personally I like the stag). The plants worship this being as a deity.
This doesn't mean we have to abandon the fungus concept. Perhaps the fungi still exist at Green's borders, hating the Plants as much as the colors all hate each other.
What does everyone think?

I know I haven't been saying much in story, because I've been spending so much of my time on mechanics. It happens.

I like this. I think people haven't been giving too much feedback because they haven't been disagreeing with anything here and realize that they're entire response would boil down to "I like this" or "This seems acceptable", which can feel like a waste of a post. It isn't, though. It's good to know where people stand.

To clarify (since this has been in my head but apparently I never wrote it down), the stag I spoke of with the sun in its horns is an elemental, not really a stag. Sorry. It's a creature formed of vines and wood, and is far larger than a normal stag. Though the sun in its horns is small compared to a real sun, it's bright enough to illuminate much of the Green continent.

What, no "Charlie the Unicorn" style stag annoyed that everyone keeps following him, and declaring him the lord of all things?

Edit: For the love of god, read this post as me being humorous.

This idea has definitely grown on me.

I like this, as far as it's gone so far.