WARNING SPOILERS OF THE FIGHT DO NO READ IF YOU DONT WANT SPOILERS
As someone who did some testing with the difficulty ?? fight. Not even talking about a numerical PoV, aka not meeting dps checks, not able to kill the egg asap, there are some severe issues with this fight that make the fight actually seem impossible from a mechanical PoV.
The very first mechanic he does, is his aoe fear. This ability has a 2 second cast time with about a 25 (ish?) yard range, that forces you to run away from him. His hitbox is so large, yet the boss will stand directly on top of you making it impossible to even dodge this fear. On the first difficulty, this ability was no problem, there was plenty of time to get out.
The second thing to note, is now the egg has significantly more hp. 15m hp, roughly. Yes this could be a tuning thing, i’m in roughly 600 ilvl gear testing this, so understanding that i cannot kill this is fine…
HOWEVER the problem is not that the egg has so much hp, the boss has TWO frontals. which he will always chain back to back after spawning the egg. As you know how cones work, the radius gets significantly larger the further you get from him. Well… you have to run to the egg, so you can drag him with you, after the two frontals, but guess what happens after the second. The AoE fear. that’s already borderline impossible to avoid. This pretty much means the egg ALWAYS spawns, making this add have a cast that MUST BE INTERUPTED OR YOU DIE.
Zekvir has two mandatory interrupts one putting a slow on you, which you can survive, as a tank, but the slow makes it borderline unbearable. The other is a massive heal if it gets off.
I love the idea of the fight and the first difficulty of this fight was actually extremely fun. Bigwigs calling out the spells, made it entertaining it felt like everything had counter play and felt fantastic. Clearing it was exciting and exactly what i wanted out of that fight! I loved it 10/10. However, the ?? Difficulty from a mechanical PoV, i have a hard time imagining any class with low mobility and not being able to take a hit being able to kill this boss anytime soon.
TLDR
-Fear’s radius is too large or the cast time of it is too fast.
-The frontals being as fast cast as they are and spammed back to back prevents the boss from being moved to the egg that spawns on the other side of the room assuring that you never get to kill the egg because he’s just always casting directly on top of it.
-The interupts are probably unforgiving, but if the egg has less hp i wouldn’t care about him having interupts that are punishing as it’s part of the allure of the fight.
PS, I know the fight is supposed to take the entire season, i know that there’s time to outscale it, and scaling is definitely a factor, as i’m not fully enchanted, no tier sets, etc. I just think the cast times are a tad too fast or the radius of them are too massive preventing you from even attempting the fight on a regular basis. Otherwise the fight is fantastic and i would love to do attempt it more, but as a DK i had zero mobility to be able to not only escape the AoE fear at the start of the fight or even dps the egg at all
Edit: Edited the title to specifically say (Tier 2) As my opinions are specifically for the hard version of the fight. The rank 1 is doable, as i’ve done it and as many others.