I'm reaching my wits end with this achievement - has anyone done this** recently **that can offer any tips? All of the information I have been able to find is years old, and I have had very little luck or progress with them... And it looks like a lot of the ways people were doing it, no longer work, or require gear levels much higher than the meta reward to complete. I understand the mechanics, I just can't seem to make a reasonable dent in his hp in the tiny window you have, and the hold out until 25+ stack meathod still out damages any healing potential I seem to be able to muster....
I have tried:
My regular zerker ranger. Making sure I don't have any/minimal stacks of the dynamic damage reduction before breaking his bar. By the time I get to a second break, I already have 5+ stacks of the debuff/buff, and by a 3rd I usually have 8+. By that point, I am hardly doing any damage, and can't keep up with heals.
Tried to cobble together enough gear to do condi-ranger..... Again, completely outpaced. The videos I have watched show that health bar dropping so much faster than I can achieve...
I then went over to my Condi Necro - I'll admit, I don't know how to play him all that well, but the life drain completely healed up any damage I did to him.
So I tried my mesmer. All of the old posts mentioned that the phantasms did all the work, and you just stay out of range of mirror blade. On any attempt I did, the boss always attacked me and ignored my phantasms and clones. I tried to shake it with Mass Invisibility, Phantasmal Defender, Decoy.... Dead mesmer.
So retiliation guardian - boss is supposed to kill himself on my industrutable hide, and it is a complete faceroll.... not so much. Boss got down to maybe 80% health, stacks pushed past 25, and my health dropped like a rock.
I'm all up for a challenge - but this one has me very frustrated.