Is there a bug with Warden Surama ????????

I know his "Collapsing Earth" can inflict almost 15,000 damage to all people, and the only way to parry this attack is to hop into an updraft and spread wings to avoid being hit then here's the issue. Even though all of us drift to the max height, we still get hit by this Amazing Attack. Is there a bug with him? or maybe it's about our control ????
Can someone answer me? I tried this boss 5 times already.....................

PS. To those who dont know who is Warden Surama, he's the final boss of Esoterrace

 

Bump for this. I tried also with my legion-mates but we can't make it.

 

Bump for myself~ hope gm can see this !

 

Come on~no one can answer this ???????BUMP BUMP

 

we tried but when surama's hp was about to worn out we got stuck. we're not moving, can't skill when the rest of the folks outside are ok. we first thought that the server crashed but it didn't. so yea i think its bug..

 

You can't beat him because he's Akuma.

OT: Seeing as Esoterrace was just added, there are probably going to be a lot of bugs with it.
I did attempt to do Warden Surama in a duo, but after 50-60% he starts spamming Collapsing Earth. No survivors.

 

and right before you resu he already regenerated his hp to 100%. dang!