Pathaleon the Calculator Pathaleon the Calculator is the last boss of the Mechanar , which is 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 at Fallen Sky Ridge in the west of Hellfire Peninsula and a mysterious scheme dubbed " Project at Firewing Point " . He is also Kael ' thas ' personal envoy between all Manaforge s in the Netherstorm . Biography . He is one of the many blood elves that followed Kael ' thas to Outland and joined Illidan , until they defected from him for the Burning Legion . Kael ' thas left a huge red crystal at Fallen Sky Ridge as an experiment , which caused the creation of the colossi and threatened the security of the zone . Pathaleon oversaw that experiment , but the Cenarion Expedition sent adventurer s to destroy the colossi and then to heal the land . Pathaleon called to Goliathon to defeat the intruders but the king of the colossi was defeated . Although this experiment was a failure , he continued with the project at Firewing Point , and as a vengeance to the druids he exploded a prototype of a mana bomb in the Cenarion Thicket . However , the Horde and Alliance sent adventurers that destroyed his plans and exploded the proper mana bomb within Firewing Point . After the failure he continued overseeing the Manaforges . He gave orders to Commander Dawnforge and Arcanist Ardonis and then kept attention to his matters in Tempest Keep . Then the Manaforges were destroyed by the Scryers . Prior to the fight . On the way to Pathaleon , groups must first clear 6 waves of adds in a scripted event . The first 3 waves come one after another . The second set of 3 ( reverse sequence to the first ) comes only when the group moves further along the path towards Pathaleon . Once the last mob in the 6th wave is killed , Pathaleon will spawn and give the group a short time to rest before engaging . It is a good idea to keep one of the guys with fire shield sheeped until everyone has regained full HP / mana , then kill that mob . If you have a mage , spellsteal the fire shield , and use it on the adds in the boss fight . Pathaleon spawns 3 elemental adds every 30 - 45 seconds , which cast arcane missiles . Like most blood elves , he has a single target mana drain ability called mana tap , which puts a corresponding mana tap buff on him - it can be purged or spellstolen . Regardless of the number of mana taps on him , he will occasionally cast arcane torrent , an AoE silence effect - it has a short duration , and can largely be ignored . Pathaleon will also occasionally mind control a random player for 12 seconds . Strategy . Waves of Adds Before the Boss . The first set of 3 waves consist of a wave of 4 blood elves , followed by a solo robot , followed by another wave of 3 blood elves . The first set will spawn once one person has stepped just beyond the boundary of the door from Nethermancer Sepethrea ' s room onto the bridge . The leader probably will not have enough time to mark when the groups of blood elves spawn , so it maybe easier just to randomly CC any two mobs and have the tank quickly pick up the remaining one or two . Alternately , the whole group can run down the elevator after the mobs spawn , so that they can be marked as usual when come back . You will be removed from combat for a brief moment after the last mob in a wave has been killed , so capitalize upon this to recover mana by drinking . If the healer is low on mana , or anyone is killed , the group can always run down the elevator to get out of combat . After the first 3 waves have been killed , rest to full health and mana , and have one person run down the bridge until the next set of mobs spawn . It ' s best to engage the second set of waves in Nethermancer Septhera ' s room , as this will increase the amount of time the group has to rest between waves . On the 6th wave , keep one mob crowd controlled ( preferably a Sunseeker Astromage ) and allow the group ' s mana to regenerate to full . If possible , spellsteal the Astromage ' s fire shield . Once you are confident you have enough mana , move down the bridge . Allow the last mob to come to your group , and kill it . Pathaleon will aggro upon its death . The actual boss fight . The best place to fight Pathaleon is in his room at the end of the walkway . The first thing to note is that he will spawn the 3 arcane elementals every 30 - 45 seconds . They have a decent amount of hit points and the arcane missiles hit for about 800 . They will all despawn when the Pathaleon is down to 20 % health . Another thing to watch for is that Pathaleon will mind control the second person in proximity to him frequently . This player will be mind controlled for about 8 - 10 seconds , during that time heal the boss or attack party members . A good way to handle this , is to crowd - control the mind - controlled player and dispel it afterward if possible . Other than that , he will melee the main tank and does not hit incredibly hard . The Domination mind control can be broken with the PvP trinket ( on Heroic as well ) . Handling the adds is probably the hardest part of this fight . Many strategies are possible . Make sure everyone understand what the plan is before starting the fight . The more commonly used ones are listed here : After downing the boss to 20 % with either of the above strategy , continue dps him and he should be dead in no time . Heroic . This fight is naturally more difficult than normal mode . In addition to his normal abilities , Pathaleon now has an arcane explosion with a two - second cast time that hits for around 2000 damage . It is possible for all but the tank and melee to avoid it , and it appears to have a 10 - second cooldown . ( This AoE is interruptible . A rogue can Kick , or a warrior can Shield Bash it while in progress . Also , Pathaleon is susceptible to mind numbing poison , which will give you a touch more time to kick the arcane explosion . ) It ' s worth noting that the spawned elementals have more HP than in normal , and it is much more difficult to bring them down . Therefore , the two adds killing strategies are less practical in heroic . Quotes . Spawn : Aggro : Mind control : Killing a player : Summoning minions : Switching weapons : Low on health : Death : TCG Pathaleon the Calculator ' s Image