Labyrinth of Touhou 2 - Deformed Entities
Holy shit was this boss ever a major wall. I've been trying off and on to beat it for like 2 weeks now. I did finally manage to find a strategy to beat it though! And only 7 levels above the minimum recommended by the wiki!
You HAVE to have a plan for the left's tankbuster. Holy shit do you ever need a plan for it. It does INCREDIBLE physical dark damage. If you somehow survive it... it will lower your max hp! Apparently it's affected more by DEF than normal but that didn't stop it from one shotting Renko with over half a million DEF and max Dark affinity! (I recently learned that affinity reduction caps at 500!) My plan for this tankbuster was a combo of shielding at the perfect time with Ako and sending in a sac tank at the perfect time. If I made a mistake (I made at least 2 of them) I would have to pray for the LOW chance to dodge it.
The wiki claims the left has the least threatening attacks but the existence of the tankbuster alone makes me disagree with it. If you try leaving it for last it rapidly becomes VERY hard to kill. In fact my team had a hard time dealing damage to it outside of Nitori and Meiling. If it's DEF was not debuffed even Nitori would struggle to deal meaningful damage. This is probably the first plus disk boss where Mari saw barely any use. I even transferred holy blessing to Meiling to help chip down the left second.
if you take too long to kill the right one it'll eventually use a huge nuke attack that deals a LOT of damage. Not many members of my team could survive this. It also constantly aoes the party and also sometimes hits your tank right before the tankbuster hits them. (this removes any shielding making a sac tank or a dodge necessary)
Overall you need good damage dealers that can handle the weaknesses of all 3 of the entities. Make sure your main damage dealers can handle some hits thrown their way. Health and affinity is far more important at this stage of the game then cranking up your DEF and MIND.