Its a great 5v5 team based RTS? game, much like DoTA, HoN (beta), or Demigod.
Free characters rotate on a weekly bases and you earn ip points by playing to unlock them forever (45 in total).
You can also instantly purchase them if you are impatient.
Kingdom of loathing -just finished up the Halloween event, but the town is still messed up from the Skeleton attacks. Still a cool game to check out with a lot of geek culture inside.