Anomalus Anomalus is a gigantic arcane elemental boss . He came into being when the Rift formed due to the high amounts of magical energy streaming through the Nexus daily . He was used as one of the guards to the Nexus and to Keristrasza ' s prison . Now , Anomalus seems to have gone out of control as his Chaos Rifts and lesser Arcane elementals are attacking the blue dragonflight . Strategy . When Anomalous reaches 75 % , 50 % and 25 % health , he creates a Chaotic Rift and uses Rift Shield to become immune to all damage . The Chaotic Rifts themselves can cast spells , which are : Crazed Mana - Wraith s , that the rifts summon , cast Arcane Missiles . The dps targeting priority is : 1 : Chaotic Rifts 2 : Crazed Mana - Wraiths 3 : Anomalus Heroic . Do not attempt to kite the boss around This boss is best tanked on the main platform that he stands on . Keep the tank on him and have 2 DPS make macros for " / target Chaotic Rift " in order to quickly take out the many rifts he will spawn . The range on the Chaotic Rifts have a very long range of attack that will span from the main platform past the 2nd platform you ran up , to get to the boss . Achievement . Chaos Theory : Defeat Anomalous in The Nexus on Heroic Difficulty without destroying any Chaotic Rifts . As of Patch 3 . 3 . 2 , He only casts Create Rift once throughout the fight , making this achievement much simpler than before . This achievement is quite tough , definitely the hardest of the instance . To do it , it is a good idea to first clear all trash on the large lower area with the mana wraiths . Your healer ' s mana is the main issue , as the charged rifts throw off a ton of damage , especially at lower health . When you pull the boss , tank him toward the back of his platform until he forms the first rift . Do not blow cooldowns immediately , save them . When he puts up the first rift shield , everyone runs down to the second platform ' s far edge to avoid the mana wraiths . Kill any that aggro , and then concentrate on survivability . If you can heal , heal yourself to save your healer mana . When Anomalus ' shield is up , he will run down to you . Repeat this technique for every shield , making sure you are out of range of the wraiths . Note that when he puts up a shield , every single rift that is up will become charged , meaning you take far more damage later in the fight . This is why saving cooldowns until at least 50 % is a good idea , as your healer will run out of mana very fast . A Paladin healer or a disc priest would probably have a much more difficult time doing this than a druid , shaman , or CoH priest . Alternate Strategy : Similar to the first strategy , clear out every trash pull from the lower levels and the platforms leading back to the entrance . His charging ( going immune ) only occurs when he is near 2 rifts at the same time . The tank should kite him about 20 yards each time he opens a rift . If you keep him away from his rifts , he will not go immune and charge , making it much easier to kill him and the healer less likely to OOM . You can continue kiting him toward the beginning of the dungeon as long as you need to take him down ( our group had the tank and healer left alive from 100k to dead , no charging ) . The adds still spawn and attack , but only the ones from the rifts nearest you . Any healer should be able to complete this strategy , assuming the group has appropriate levels of gear .