This game actually came to me in a dream and I've been spending a little daydreaming time here and there brainstorming ideas for it. I think it'd be pretty fun. So, here's the basic idea:
I'm thinking of a battle arena type game with heroes in 3rd person, sort of like a fighter game with intricate combos and defense etc., but controlled with free roaming like God of War. Ideally, it would be multiplayer, with team matches like Dota with your team roaming around in a large jungle arena (or other maps as well) seeking out the other team. You can pick your character class before each match, like an assassin (climb on trees, high attack, very low hp bar) and berserkers (doesn't have a mini map, very high hp, high attack), etc. It'll be realistic (as far as it can be) in that you will die after being stabbed by a sword in vital areas, etc. I was also thinking of a kind of leveling system in game for developing attacks and such during a match, but haven't come up with anything practical.
Sort of rough idea, what do you think?