Lord Valthalak Lord Valthalak is a Drakonid boss summoned in Upper Blackrock Spire by a Brazier of Beckoning . Strangely , he is categorized as a humanoid , and not as a dragonkin like other drakonids . He is the last boss in the Dungeon Set 2 quest line . Attacks and Abilities . Phase 1 . Valthalak has a caster type weak melee attack in phase 1 . A slow one that does 400 - 500 damage to a warrior . Shadow Wrath . A shadow - based , chain life drain , which obviously translates into healing for himself . Hits for 750 Shadow damage on the first target , and will jump to another target if anyone is close enough . Each time it jumps , it doubles in damage in the manner of Holy Wrath from High Priest Venoxis from Zul ' Gurub . At the 4th jump , the damage will be 6k and lethal for most people . Being a life - drain , all damage dealt will heal Valthalak . Heal . The chain life drain ( noted above ) will replenish his health , so it is important that you have a warrior tank the mob alone ( until phase 2 ) . Alternately , if you have more people in melee range , you will need to interrupt when he casts the life drain . It will show as a purple beam that chains between friendly targets . Have one or two people mana drain him ( his regen and total mana are quite low ) . The spell is also interruptible using standard methods ( Shield Bash , Earth Shock , Counterspell , etc . ) . A mod such as EnemyCast or Spell Alert can be helpful . All his spells will sadly not show up on the standard ' EnemyCastBar ' you can have displayed below the enemy portrait . Lord Valthalak apparently has no specific animations when he heals . Warriors with Mortal Strike would greatly assist , as well as rogues with wound poisons . It is also possible to just DPS through the heals . The rate that Valthalak heals himself appears to be random . Spectral Assassins . These spawn two at a time throughout phase 1 . They will run towards someone in your raid ( can include pets ) and eventually cast a mindflay - like Defile ability ( a purple vile beam ) . Defile cannot be dispelled / cleansed and stuns its target for ten seconds . If the spell is allowed to complete , its target dies and is transformed into an additional Spectral Assassin . The assassins have around 1 , 500 hp with little to no armor and resistances . Phase 2 : Enrage . At 40 % health he will switch weapons and start hitting very hard . He stops spawning Spectral Assassins but still does Shadow Wrath if he has mana . Phase 3 : Shadow Bolt Volley . At 15 % health , he will frequently cast an AoE Shadow Bolt on the entire raid in addition to the changes in phase 2 . Summary . This strategy results in an easy , but long fight , usually 7 – 10 minutes . Your healers need to come prepared for an endurance fight , other than that it makes for an easy run . Solo Notes . He is still a tough fight at level 80 even in Tier 10 - level gear if you intend to solo him . The spectral assassins must be dealt with immediately before they can cast Defile with its 10 - second stun ; otherwise , Valthalak will get 10 seconds of free DPS and healing if Life Drain is also up ( meaning death to cloth - wearing characters ) . Life Drain also works on pets / minions , which makes this ability all the more dangerous to either you or your pet , depending on which one is at the end of the chain . This is a major DPS race to try to keep more than a couple of spectral assassins from spawning while keeping Valthalak ' s damaging abilities to a minimum . Be prepared for several deaths while you get the feel of the fight . Easy Mode Solo . Use a Free Action Potion to make yourself immune to his summoned adds ' stun effect . This makes the fight trivial at level 80 .