Title says it all?
The Effusion can be killed solo.
I have never been there but I would tried an AI weapon. Use AI vs the boss. When it summons something use CW + MS (to don't lose perfection on the boss).Tactics
Always kill the summoned creatures first. Especially the Corporeal Brumes take a while to kill and have high physical resists. If you fail to kill the summoned creatures quickly the spawn can get out of hand. Barding skills help a lot. If too many creatures have spawned leave the main room through the red moon gate. Lure the spawn away from the teleporter tile and go back killing the spawn one by one. Beyond the red moon gate there is also an ankh. Be careful with the second moon gate: It leads out of the peerless area and there is no way back.
no.Don't you lose your perfection this way (using WW)?
Yep, saw it. He was a Whammy using Curse Weapon. He was using either a Bokuto or a Leafblade to keep Feint up constantly. The Leafblade also has AI as a special.I've seen a Japanese player solo it on Youtube, but it looks like their videos have all been deleted.