Nvm, its a gear issue.  89 is the farthest i go for now. 

You're gonna want to start with Wurlim/Vogoth and build from there. it will be tough though. Maybe with Vizier you can keep the important debuffs up. 

There is a champ that maybe helps thorugh that stage and is worth lvl 60 for other content anyway: Sandlashed Survivor. Her passive with allie protection + block damage on herself may help you to survive an additional explosion of the dread bombs.

Don't use her A2 in the boss fight, you don't want extend your buffs until Bommal removes them, he gets extra damage for every removed buff.