Little is known about King Behemothon other than that he was negotiating an alliance with Illidan Stormrage. After the player disguises himself as an Illidari blood elf and slays a number of collosi in Shadowmoon Valley, Behemothon loudly declares that he will never ally himself with Illidan.
- Brashly you have attacked my children, Illidan! The pact is broken. Giant will never side with elf! NEVER!
- Behemothon, King of the Colossi roars in defiance.
Using a hunter's track giants ability, he is found at 50,62, presumably below ground. He can't be targetted perhaps because he is underground but has a model which resembles the other colossi except with a slight green tint and green crystals protruding from his back.