Abyss on death effects too strong

As fissure warbringer, I'm dying more to that in 515s than I have throughout my entire journey. I've lost an entire level in the past day to this TOXIC mechanic that is not fair for melee. I can't heal through it, I often can't roll out of it before my 2400+ hp is gone. No combat log or map legends, etc who knows what element it is or even if there is a resist? I have 30 chaos and can eat a lot of that so idk. I just know I'm about to quit over this unfun thing that is gating my progression.

* T15

My Titan is facing that too in the depths . It's a shit mechanic. You can't even roll out of it because the arena is so tight and small.