Leotheras the Blind Leotheras the Blind is the third Boss of Serpentshrine Cavern in Coilfang Reservoir . Lore . He is a blood elf demon hunter who is apparently possessed by a demon himself . Kael ' thas Sunstrider originally sent Illidan Stormrage 5 blood elves to train as Demon hunter s . Three of them died in training , Varedis succeeded and now trains more demon hunters at the Black Temple , and the fifth one , Leotheras , went insane and was exiled to Zangarmarsh , where he found his way into the lair of Lady Vashj . Abilities . Humanoid Form Abilities . Melee : 2500 - 3000 on plate Whirlwind : Demon Form Abilities . Chaos Blast : Leotheras ' only attack in this phase , centered on his current target . Inner Demon . About 25 sec into the Demon Form phase , Leotheras summons Inner Demon s for up to five raid members ( never for the person with aggro ) . The inner demons can only be attacked by the person to whom they belong . If Leotheras returns to humanoid form while an Inner Demon is still alive , that person becomes Mind Controlled for 10 minutes ( non - removable ) . Pet classes must make sure their pet does not get the killing blow , the Mind Control is only prevented if the player deals the death blow . Inner Demon capabilities : Strategy . Humanoid Form . Whirlwind . During a Whirlwind , Leotheras targets his victim . If that person runs away fast and far enough , he will deaggro and whirl towards someone else . It is possible to have ALL raid members avoid being hit . If people are hit by Whirlwind , they must be healed . The DoT part can only be removed with Divine Shield , Blessing of Protection , or Ice Block ( Stoneform no longer removes it ) . The aggro wipe can be overcome with a hunters Misdirection . Other tricks include having someone place Gnomish Flame Turret / Searing Totem on the tanking spot ( Leotheras will aggro this , allowing the MT to get aggro back easily ) . Bleeds or any other tank DoTs also help them gain aggro immediately when they tick after the aggro wipe . Having a Paladin main tank this encounter is also a good idea because he doesn ' t have to chase down Leotheras , but can simply throw an Avenger ' s Shield . Like most raid bosses , Leotheras is immune to taunt . Demon Form . It ' s a frequently used tactic to have a demo specced warlock with felhunter and high fire resistance tank this encounter . Nonetheless , it ' s also possible to tank him conventionally . A combination also works - a normal tank taking the first few attacks can help the warlock tank survive the entire phase . Tips for warrior tanks . You need to have about 365 fire resistance and about 18K health raid buffed . Flasks of Chromatic Wonder are great for this . Tank him at the edge of his hitbox to protect melee DPS from being hit by the Chaos Blast splash . The incoming damage will go from zero ( no debuffs ) to most of your health bar , but if healers are on the ball you should be able to go up to about 12 - 14 debuffs before being instagibbed . Thunderclap seems to reduce the frequency of attacks which will make you survive longer . Threat will probably be a problem , especially when you ' re not taking damage , so using Mighty Rage Potions is a very good idea and will allow your raid to squeeze out more DPS . High stamina DPS gear will also help assuming you can reach the maximum fire resistance , and use Battle Shout until you have about 4 debuffs then switch to Commanding Shout . Ask a friendly Paladin to cast Divine Intervention on you during the last 15 % if your debuffs stack too high , as this will remove them . Ideally do this when you have a full rage bar to allow you to get him back off healers , and click it off quickly before people start dying . Inner Demon . Whenever a player has to deal with an inner demon , he should be healed by the non - affected healers , even if self healing - capable . DPS classes should find this encounter rather easy . For some classes a few hints may help : Split Phase . At 15 % , Leotheras ' Demon Form splits from his Humanoid Form , and both forms must be handled together . The Demon Form starts with 100 % health , while the Humanoid Form retains its current health . The Humanoid Form abilities are the same as before . The Demon Form still uses Chaos Blast , but no longer spawns the Inner Demons . Upon defeating the Humanoid Form , the Demon Form despawns . Notes . As of 2007 - 08 - 02 , Inner Demons are bugged , and if a players pet lands the killing blow on the demon , the player will still be mind controlled . Trivia . It should be noted that Leotheras ' demonic side seems to be out of his control , easily leading to the theory he was the Blood Elf , of the first trained , that went insane .