C'thun

C'thun is one of the Old Gods from the Warcraft universe and the first to appear in World of Warcraft as the final boss of the "Temple of Ahn'Qiraj raid dungeon from patch 1.9. He was the hardest boss in the game until "The Burning Crusade" came out.

C'thun is the controlling force behind the Qiraji race, which he created based on the previously existing Silithid race of insects. When fought, C'thun initially appears as a giant eye, but when that it destroyed his true form is revealed as a bizarre tentacled mouth creature with enormous fangs. Players can also hear him "whisper" to them whenever they are in the Ahn'Qiraj dungeons.

C'thun is obviously named after Cthulhu. He also makes a cameo appearance in one of the Burning Crusade quests where a cult of Arakkoa are trying to summon him again in Shadowmoon Valley.