Ok, 2nd attempt for us (Apathy).
We got all the way to PW with about 30 mins left. Those lamps die fast but they're no joke. Once we killed all 8, we got PW to 76% before we had everyone run to different tunnels and stay hidden there till after Astral Flow. But guess what happened? It summoned all the avatars, and Astral Flowed every single one of us. It killed all the melee in the East tunnel. And then it Astral Flowed all the BLMs in the other tunnel.
It seems it goes after anyone with any kind of hate and will keep doing that till every single one of your LS is dead. We took about 4-5 mins to get it down to 75%.
This shit is just too rough. It will keep Astral Flowing, too, lol.