cant hit zalmarath

playing shockwave totem warrior, fight starts fine every time then at some point randomly he stops taking any damage every time. mostly using shockwave totem/earthquake

Yes I had this yesterday, same build as you.

update: I killed him but it was a long fight, after he moves position with the bullet hell attack he becomes hit-able again

Also happened to us, party of 2 (Gemling Legionnaire and Chronomancer Sorceress), Cruel. About 3 times during the fight boss just stopped being hit by any of our skills. When he starts switching position on the arena, he becomes targetable and takes damage. Took too many minutes to put him down. This is certainly the most bugged fight/arena in game we've encountered so far (just got to early mapping, so there may be others)...

This is still happening. I can't target him at all. I waited dodging for 15 minutes and he wouldn't move to become targetable again. Tried again, and managed it (he moved). It seemed to happen when I was mid attack and got shoved by his hand (not damaged, just forcibly moved).

Same, tried him 3 different times, I'm just sitting there trying to hit him and nothing is registering....