It's just the strategy.
What we did:
Level 32 sword bearer.
Four guys with rockets.
Kill only the boomers on the right. The left ones are optional.
When it starts, you clear out the room. Head either left or right and meet in the middle outside the glass.
Someone get the chalice
Sword guy lures sword bearer to the middle.
Take out the right boomers
Sword bearer drops
Wait for sword guy to get in position and to say go
He says go and we unless four rockets
As soon as he says go he waits a sec and jump toward crota
He gets three hits
Jumps back, as soon as he jumps back we released four rockets
Kill the boomers on the right
Sword guy gets another three hits and runs away
Rinse and repeat.
Seems easy in paper. But we only had one guy with maxed ice breaker
Three ghallajhorn
One truth
One sword bearer
Everyone should have time to clear the boomers, it takes two shots from a level 31 and one from a 32
Ogres come out, you go down the middle