The Seven Elements[]
In a dimension seperate from ours, the Seven worked in harmony. Frostia, Flamia, Necrox, Tornadia, Dustus, Atomia and Electria. Each one supported and weak to the one before it, and strong against the one after it, while Electria is strong against Frostia.
I've made the whole thing into a role-playing game, based off the likes of DnD, Pathfinder and other games.
Currently it's still in beta and I'm thinking of new things for it daily.