Yea the beams were odd, maybe they aren't so bad with audio on but I usually play with music and like 0 game sound. They did almost nothing in the first phases but then in the final phase even getting scratched by one was death.
It's probably doable if I don't blow 3+ portals trying to move the storm things around and actually finding a place to fight him. First couple phases are pretty free at least as he just doesn't do all that much. The movement in phase 3 isn't even really the problem, it's trying to find time to actually put damage on him during all his nonsense as well.
I'm at I think 1% chaos resist, so not the worst but not great either. I can't keep full uptime on Atziris in that fight either, so I may just ditch it for another health flask and try again.
Maybe you were getting hit by the big beam? His small beam does kinda shit dmg in every phase, but every few beams he'll do a much larger beam, that's really 4 beams in a row of different elements(and they 100% freeze/shock/ignite/whatever the 4th is). In phase 1-3 this bigger beam behaves like a normal beam, only a bit longer, however in the last phase this beam will also partially track you between each hit, like he'll be able to move about 35-40° overall, so you need to be hauling ass and keep running until he's done or you'll get clipped. These bad boys do A LOT of damage and generally will stun you if you don' thave stun immunity, leading to getting hit by the other beams too. This is the one where he says "Die!" and it's useful to have voice on for that fight at least for this cue.
The storms is really something to get used to but once you do it's pretty easy(although I died earlier on my 8stones awaken run because I expected the storm to stop moving as soon as he started the landing speech, but turns out it doesn't and ate me while I wasn't moving like a retard). You can do it 2 ways, either far away and wait for him to move out, but this one's risky sometimes because what happens when he lands is the storm is pushed out, but if the angle is fucked, it'll be pushed out towards the entrance, which will almost 100% brick your fight if you die. The 2nd is baiting the storms calmly in their "intended" spots, it helps if you know where they go though but that one's pretty safe once you know.
Last phase definitely doesn't have too much DPS uptime but you can punsih some of his moves heavily, specifically the 4 beams rotating shit if you find him you can actually hurt him during the entire cast of that, and during the corridor shit if you stand just right you can be to his side but not getting hit by balls he throws down the corridor, without turning it off(alternatively you can summon a totem in front of you and stay in the corridor DPSing the entire time if you're ranged). The rest of the mechanics you kinda have to run a lot so you want to capitalize on these, although on the 4beams spinning shit you want to get ready as soon as it ends cause he likes to follow up that one with the Die beam and you'll get ass fucked if you're not running when he casts that one.
Honestly the fight would be a lot easier if you could retry it right away, fight him 3-4 times and he gets pretty damn easy, but the fact you have to go 60+ maps inbetween fights fucking sucks so much, and the first try unless you spend a shit ton of time watching videos you're probably going to waste 6portals trying to do storms and not learn much.
I absolutely melted him earlier on awakening 8 though, upgraded my gear a fair bit and gained like 30% DPS, on a DPS that was already really high. Felt pretty good other than the death to the stupid ass storm not moving away/stopping right away, my mistake.