Pathaleon the Calculator is the last boss after Nethermancer Sepethrea in the Mechanar, one of the satellite structures of Tempest Keep. He is the mouthpiece of his demon-crazed master, Kael'thas Sunstrider. He is the head of all the blood elves' devious schemes and has been connected thus far with the massive red crystal in the west of Hellfire Peninsula and a mysterious scheme dubbed "The Firewing Point Project". He is also Kael'thas' personal envoy between all Manaforges in the Netherstorm.