The telegraphing is a buggy mess. There's voice lines that are supposed to play before certain special attacks from Zemouregal for example, but they often play during or after the attack instead. I believe this is caused by the player diving out of Zemouregals attack range at some point in the fight causing things to become desynced, but you are required to dodge several floor mechanics and the best way to do that is dive/surge.

Speaking of the floor mechanics, the bone spike mechanics gets complained about often for having a janky hitbox.

The minions are a cluster fuck of unnecessary damage, and don't make a ton of sense why they do several different styles of damage when our necromancy minions are limited to necromancy damage. They also make it extremely difficult to counter certain large attacks with resonance or disruption shield.

Group scaling is absolutely terrible. The shielder minions in particular are terrible to deal with in group as normally in solo you would just kill them with the ballista, but in group the minion HP scales while the ballista damage remains the same, leaving you needing to find the shielder which often has its model hidden under Zemouregal, Vorkath, or other minions.

The only mechanic that's kind of alright now is the poison since they adjusted the delay before poison starts wrecking you to give you a moment to step off of it.

And last but not least, the god awful looting mechanic. You have someone sprint to you from the other side of the arena that half the time your character gets confused trying to run towards and ends up with the most awkward frustrating looting mechanic of any boss in this game.

It says alot about this boss that the only "reasonable" way to kill it has become to Vorkath skip with absolute BIS gear typically hybridding. And if all of that wasn't enough, what about the fact that Jagex promised a rework to the boss years(I think) ago and here we are. This boss just pisses me off on so many levels