Warrior Unable to Hit Zalmarath, The Colossus

As a Warrior I am unable to defeat this boss not because of skill issue but because of It not letting me be able to hit him. I have thorns build going and I am tanky so I usually am just going toe to toe with the boss wailing on them. But for this Boss Zalmarath when he stabs the ground and pulls his sword towards him, it also pulls me a little closer to him as well. Somehow that glitches out the game and I am unable to attack him. The only damage that I could do is thorns damage, and its pretty hard to defeat a tanky boss only use thorns and no other skill to help out with it. The link I provided is me showing that I am unable to hit this boss with attacks or skills, if damage was done in the process of this small clip it was because of thorns damage.
https://www.youtube.com/watch?v=mkK-CdBNMd8

I'm experiencing the same issue as a warrior sometimes it happens and gets undone and then I can hit him again but the issue appears again before I can kill him

Yep ran into this today on a totem warrior. It seemed like during the phases he would migrate to the right side of the arena, sometimes he would just become invulnerable. I couldn't figure out what conditions would do it though. I was using shockwave totem, earthquake, resonating shield, and mace strike.

Same problem here. Playing rolling slam warrior and have to force quit the game because he becomes invincible and I can't do any damage at all.

It only didn't happen once when I got him down to 75% health but died to his ads anyways. Other than that, I can't get him back to that point due to him being invincible

This just happened to me as well. Tried exiting out of the client and loading back in without success. Had to die and reset the boss to get his hitbox back. Really frustrating, this has been my only death on the Warrior so far.