Remore/rework this boss. Hes mechanic its totall BS impossible on some classes, the RNG of mechanic to works even if you do correctly it something special, hes rage is insta death as he don't take damage anymore in rage and you pretty much dead. - 29% AP is even bigger joke  429DP i'm  going from 100% to 10% from hes shout.

Yes i know the mechanic, its works like 1 time out of 10 times, you have to success 3 time per fight, good luck to roll a 10% chance 3 time in a row.

I've been doing Pit of the Undying since shortly after its initial release. I've done the Pen daily on 4 different classes, awakening Kuno, awakening Mystic, Shai, Awakening Tamer. Never have I noticed any kind of rng in those fights. Also I did the PEN daily quest back when I only had 349 DP before the AP nerf on those bosses consistently without fail. If you can't do it you're doing something wrong.

So you tryhard with swapping classes  2 years ago for at least ~6month's , very cool bro as i said, some classes just can't, please dont start that bs about its a skill issue especially when you swapping classes to do daylies. Even at initial release ppl complained about its being not worth any efforts.

The whole idea with pit changes was to make it more acceptable and easier, what the point of nerfing stats if you leave unbeatable mechanics.

Also i know you don't have to fight this guy for PEN  Insignia, probably that's why PA didn't care to change this boss.

Read about mechanics, learn. It sounds like you have no idea what you are doing. Those bosses are easy, all of them, but you must put a little more effort and read guide and understand their mechanics. 

No, I'm not try-harding and swapping classes. Those are just all classes I tried it with. Whenever I tag a class I play it a little in PvE to get used to it and that means I'm also doing Pit of the Undying with said class. Also I remembered I had succession Sorc and awakening Drakania tagged for a few days and did Pit of the Undying with those classes too.
And about the ‘making it easier’ part: now that the bosses are so squishy you can just skip more than 50% of the mechanics. Syhazar you can easily skip 1 of the 2 mechanic phases and if you get lucky with animations or try-hard you can even skip both mechanic phases. Duran you can completely skip the mechanic phase depending on class. Even if you don't do that it's still an easy 1 mechanic and done. Gotha Rensa you can skip 2 of the 3 mechanic phases if he does devastation; maybe even all 3 mechanic phases, though I never tried that so I'm not sure. Can still skip 1 mechanic independent of which attack he does. Ascendra is the only bullshit rng bosses because the time the mechanic takes is dependent on rng. You only have to do that mechanic once though. Kyril doesn't have a mechanic. Kharoxia you can easily skip all the mechanics. The PEN daily takes me ~4 minutes to complete if I pay a little attention or 5 minutes if I'm braindead. 

I tried to do this as succ Ranger, and it is nearly impossible to do that if I don't unlearn and block skill. Every skill that has KB of floating have "Nullified during cooldown" like "Charging wind" 5s CD, "Fury Arrow" 14s CD or "Tearing Arrow" 7s CD and only when fully charged.

I need to block magnus skill "Binding Arrow"(which has Floating, but it has 9s CD) to be able to use "Crescent Kick" which it has no CD float and I need additional block another skill "Round Kick" which is interfering with that skill then I must stay nearly face to face with boss to be able to float which is blocking me in place then I have millisecond to evade his shout if not I'm dead. This must be done to do just one 1 boss and that is a BS. Same thing with Duran, it has mechanic to use stiffness and Succ ranger don't have any skill which has PVE Stiffness only PVP, so I need to force DPS him. This is not a skill issue, this is a dump mechanic which shouldn't exist in widely available content. Even Awakening Ranger has high CD on KB or Floating skills.

No stiffness for Duran seems like an issue indeed. 

For Gotha Rensa how about quick slot Crescent Kick? You should also have enough time to iframe afterwards before getting hit.

If not uncharged Charging Wind should be enough to also do the job, its cooldown is low enough.

there are quite the huge differences. this boss indeed needs to be CCed multiple times, with very short timeframes.

the mechanic is no rocket science - it's super easy on certain classes. but some just suck ass.

this saeei dude just knows nothing about the other 20 classes it seems, and probably thinks he's the only one that knows this boss needs to be CCed LOL.

there were more problems before PA decided that you can bypass mechanics on most of the bosses now. some classes could not do certain bosses AT ALL due to lack of CCs needed.

Good luck with that. 5s CD on CW and it's slow and 7s on iframe when boss do the mechanics very fast and u must react in millisecond not seconds. Adding skill to the quick slot is not a solution because it still blocks in the place, and it is slower than using combination key and cannot be used continuously if u miss the first time. Mechanic on this boss is broken whenever u agree or not and should be changed

I mean maybe I'm missing something...

But every class should have a spammable PvE iframe. And I know a single 5 second cd float ability is enough to do the mechanic. 6 second is slightly too long cd.

I did Duran on 7 different classes in total, also I've been doing Duran every second day for more than a year now. I'm saying I have some good knowledge on that fight.

True I don't know succ ranger but I just don't want to believe none of your floats or knockbacks are good enough to do the mechanic. The counter-attack roar is also decently enough delayed so that you can iframe after most animation-locks. You don't even need to iframe it always, depending situation a simple dash is good enough.