Nethermancer Sepethrea Nethermancer Sepethrea is an optional boss in The Mechanar wing of the Tempest Keep . She is likely an assistant to Pathaleon the Calculator or she may be in charge of the production of manacells . Strategy . Normal . When the fight is initiated , she summons two Raging Flames ( Fire Elementals ) that are immune to all forms of crowd control . They move slowly , and will chase a randomly selected target , leaving damaging trails of fire behind them . Their targets should flee , kiting them around the room . Every several seconds , the elementals will cast Inferno ( like Hellfire except the caster does not take damage ) around them , which should be avoided . After the Inferno is cast , they will randomly change to a new target . The boss herself makes tanking difficult , as she can repeatedly disable the tank . Quick dispelling can deal with her Dragon ' s Breath , anyone who gets aggro , especially if the tank is snared , will need to run to the tank . Attempting to pull her beyond the room will reset the encounter . A useful tactic for this encounter involves using her own slowing attack against her . When the tank is slowed by her Frost attack , he can pull her around the edges of the room at a moderate pace , maintaining enough distance from the Fire Elementals and allowing ranged DPS to unload when they can . Just be sure to keep an eye on the healer . When she disables the tank temporarily , she quickly runs to the next player on the threatlist , so be sure to recover that aggro quickly when this happens . Be sure to avoid going down the hallway towards the Final Boss , as you may accidentally pull the waves of mobs down there , which will invariably lead to a quick wipe . Heroic . Three Raging Flames spawn , rather than two . As of 2 . 2 . 0 , the elementals act like the Normal mode elementals , except that they run at 80 % speed , not 50 % . They will switch targets quickly if kiting is attempted . Fire resistance can be helpful , as fire damage is almost guaranteed here . One method is to have your tank stand in the very middle of the room and have your DPS ( Ranged or caster preferably ) spread out into the 4 corners of the room . She will slow the tank when she hits him so the tank will only move when the fire elementals walk near him and leave the fire path / adds come near him and begin Hellfiring . This way , when the adds come the DPS immediately has distance on its side . The DPS / healer will move around the four corners , something of a throwback to the Razorgore fight . It is absolutely imperative that the DPS and healer stay within max range of the tank so that when the adds are not chasing them , they can remain static and do their jobs . Another method used successfully ( pre - patch 2 . 2 . 0 ) is to have your healer stand down the hallway ( after having cleared the final boss ) and then run in once the tank has pulled . This gives your healer a better chance of not starting out with initial aggro . Alternatively , a method that has worked well on numerous occasions is to take 2 well geared warlocks who can cast Seed of Corruption on all targets and a decent paladin tank to then use Righteous Defense . With 3 elementals and the boss , around 1100 damage ( plus damage modifiers ) per mob per tick can be achieved . Quotes . Aggro : Killing a player : Dragon ' s Breath : Death :