12. C'thun

Game: World of Warcraft

Location: Ahn'Qiraj in Silithus

Watch The Final Battle: Click Here

How To Beat Him: Originally, C'thun could break highly-coordinated top-tier guilds. Now you can get together a couple dozen level 70 characters formed from a random pick-up group, and if you minimize superfluous chatter on Ventrilo it's possible to execute a reasonably-mapped strategy to take this old god down.