DO NOT buy this game. It is a multi-player game that claims to have a solo campaign. The solo campaign are challenges like an extended tutorial. So what is this game? A turn based strategy like a complex game of chess with a board where you either destroy crystals or the other players to win the match.
Why is multiplayer bad? Because it is turn based, you finish your turn and then wait for the other person to complete their turn. How long does that take? Could be one minute, or it could be hours or days. In fact there is an achievement if you take 24 hours to make a turn. Rewarding someone for wasting someone else’s time is never a good thing. To compensate for this, you can play a lot of games at once. Like chess via mail. I was so completely bored playing this game that I literally opened up another game to play it as I waited for people to perform their turns and get back to me.
When you start a match, you select from one of your owned factions. You start with humans and TF2 factions when you own the game. Then if you want the other races like Elves, Dwarves, Shaolin and Tribes, its $5 each. Each faction has its own characters that play differently.