Serpentshrine Cavern Serpentshrine Cavern is the raid wing of Coilfang Reservoir , where has made her lair . It is a 25 - man raid instance with six bosses , culminating with Lady Vashj herself . There is no longer an attunement required to enter this instance . For most raids , Serpentshrine Cavern will come only after the raid has been farming Karazhan as well as Gruul ' s Lair . General . NPC Respawn Timer . Respawn timer for all trash groups is 2 hours . If their related boss is defeated , they will not respawn . The water . Scalding Water . As long as the 6 platform packs surrounding are cleared , the water will be boiling , killing all of the in the water . Entering the water during this condition results in a Scalding Water debuff , which inflicts 500 damage every 3 seconds ( avoidable by using any forms of waterwalk ) . This is considerably less damage than attacks from the Coilfang Frenzy . If the platform packs respawn , the water stops boiling and the Coilfang Frenzy return . Defeating The Lurker Below prevents both the Scalding Water and the , allowing more convenient navigation of the instance . NPCs related to Hydross the Unstable . Once is killed these will no longer spawn . Pack type 1 . This is the first type of pack you ' ll encounter as you enter . There are about 3 of these packs before . 5 tanking classes of some sort can be used , although the s can be CC ' d when not enraged . Tank the s away from the group to prevent silence . Burn the while his Serpentshrine Sporebats are tanked ( they randomly charge ) . Once the Coilfang Beast - Tamer is dead , the Serpentshrine Sporebats will lose their enrage , at which time they can be Crowd Control led . Burn the Coilfang Hate - Screamers and then finish off the bats at your leisure . Note : If the Serpentshrine Sporebats are sheeped far enough away from the Coilfang Beast - Tamer , occasionally they do not become enraged and break sheep . Underbog Colossus . appear as single pulls between each of the Pack type 1 ' s . Although their abilities can require some thought , they are relatively easy . Nature resist gear helps . Platform around Hydross the Unstable . These mobs move around ' s platform s come from the right and stop in front of Hydross the Unstable and become then continue along the platform . They have relatively low hit points but a huge aggro range . Hydross the Unstable encounter . During the encounter when changes form he will spawn 4 adds . for poison form or for water from . NPCs related to The Lurker Below . Once is killed these will no longer respawn . In addition , the Scalding Water and are removed . Pack type 2 . These occur on the 6 platforms encircling the ' s pool . Each pack consists of 1 , 2 s , 2 and 4 . Crowd control the Greyheart Technicians and Coilfang Priestesses , then focus damage on the Coilfang Shatterers first , Vashj ' ir Honor Guard next . The Greyheart Technicians are weak and can be killed very fast when lacking CC ( a single Rogue can easily take one down ) . Note : On the third group it is possible to accidentally pull the patrolling from the platform to the left by standing too far to the left hand side . Everyone should stay to the right hand side of the third platform . The Lurker Below encounter . When dives , he spawns a total of 9 adds : 6 ranged s ( 2 on each platform ) , and 3 melee s . All these adds can be Crowd control led . NPCs related to Morogrim Tidewalker . Once is killed these will no longer respawn . Pack type 3 . These packs occur on the bridge to Morogrim Tidewalker ' s room . Crowd control as many Greyhearts as you can , and keep an eye on the ' s totems Pack type 4 . There is 1 of these packs leading to the room where resides . None can be CCed , the es mind control and AoE knockback . Using the convenient wall / platform to your left it ' s possible to train some of the mobs while you focus on the others . It is also a good idea to have dps hit the Coilfang Fathom - Witches quickly after the pull , they mind control people 2nd on their aggro table and if another tank is 2nd then you will have a loose mob Tidewalker murloc pack . These packs run around near ' s room , generally they are packs of 5 - 6 random murlocs . Their damage is fairly weak , so tanks can tank 2 without much trouble , it is possible to have a Paladin tank multiple groups of these monsters at once , however it is wise to have additional tanks ready to taunt the Tidewalker Warriors if / when they drop aggro due to Righteous Defense being on a 15 second cooldown . Fathom - Lord Karathress encounter . These are the adds during the encounter . NPCs related to Leotheras the Blind . This is the trash in the room with leading from Karathress . Right and left of the room beyond Leotheras are two of these packs . This is leading from Morogrim ' s room . Packs : get away from the mushrooms that Serpentshrine Lurker spawn . they explode and release toxic green goo . . . in the middle of those beyond that room there is a pack of Note : Not sure if this changes will check next week Loot . See Serpentshrine Cavern loot Attunement . - - - Not Required - - - As of June 19 , 2007 , Serpentshrine Cavern no longer has a required attunement to enter . The attunement quest chain remains in - game , and must be completed ( along with the Tempest Keep raid attunement ) in order to obtain the title of Champion of the Naaru .