Geonor as an endgame boss is too much

During campaign he is pretty doable because even if you get his by the sky laser beams you arent gonna die.

Meanwhile at endgame this mechanic is just too deadly, they fire way too fast so you can absolutely avoid them if you are lucky and there's a big open space inbetween, but if you are in a tight spot and move right to avoid the one in the left, by the time you see there's another one on the right you wont have enough time to respond.

And when you get hit you get frozen, and then you get hit again and die even with maxed out resistance.

This has been one of the few mechanics in poe2 that just feel impossible to completely avoid, there's too much RNG in the placement, half the times I will not be hit but you only rly need to be hit once to die if your frost charm is out of charges.

You definitely need more defenses, and likely more movement speed.

Remember just moving is always faster than dodging. Though dodging should be used in a timed manner for slams and fast attacks coming your way.

I'm by no means a top player, but I was able to handle citadel Geonor fine.

His abilities didn't one shot me if they hit, and they were mostly avoidable.

I know 'skill issue' is toxic, so I definitely don't mean it that way. But you simply just need to practice the fight a bit more, and/or likely raise some defenses.

Make sure resists are capped (yes you mentioned yours are), and that you've got like 60% evasion or at least a chunk of ES above 500. Once I slapped on a hybrid body armour (evasion/ES), my survivability went way up. Energy Shield is way too powerful, but its there so utilize it when possible.

Life should probably be above 2k.

Consider boots 30% or higher in movement speed if possible.

If an armour based character, know that armour slows you down.

And don't shy away from movement abilities like leaps or shield charge if you've got a spare skill slot. They can be low level for stat requirements, they aren't meant to be damaging in this case, just as utility.

I find with his multiple ice sky beams, it's best to retreat to the farthest part of the arena and run around the outer edge. Again, don't dodge roll unless you think you're going to get hit. Focus more on just weaving your moving character around obstacles.

Good luck!