It's one more achievement which is alike to the other achievement called the Chaos Theory about which we've written earlier. It requires from a player to be self-restraint, eventually. To receive it, a tank from your team should pull and attack three spiders (but shouldn't kill them), and DPS should defeat all mini-spiders. After this was done, you have to kill the boss as you usually do while the tank is being under the boss and his watchers' attack. And finish him until he is dead.
Here's one more way on how to defeat this boss. Your DPS (it'd be better if these are warriors or paladins) should try kiting three watchers to the entrance where they should use a shield or bubble spell. All they have to do now is just stay there and receive the damage from the mobs while their teammates have a chance to kill the boss. This method is costly, but it works well. Players tried this strategy in patch 3.
You'll see three platforms at which he can get his Temporary Electrical Charge. Don't forget to clear the platforms and then hurry up to attack him until his buff action ends. The simplest method how to do it is killing his guards and then killing the boss itself. Be careful: his attack while he has buff on is extremely powerful.
You must be patient while doing this achievement. It's said that any of the portals there shouldn't be destroyed during the fight. It won't be that difficult if you have a skillful healer. Defeat the additional mobs, but don't touch the portals. The boss will use his spells 3 times — when he has got 75%, 50% or 25% of the health. One useful hint is that you should stand behind your tank at the moment the boss becomes a rift — so, you won't be hit by the lightning whilst your DPS are killing the respawned adds. Next step is to kite the boss and continue killing him: when he enters the phase once again, you'll need to repeat the process until you defeat him.