Killing Shadow Reimu Last
(If you haven't already, I'd recommend reading the descriptions for the Shadow Reimu and Marisa video, and then the Shadow Marisa video before this one)
So, Ms. Main Character herself. What is there to say about her? If she's the last one standing, Reimu attains the special, Fantasy Seal -Blink- buff. It activates automatically before she acts and it gives her a permanent 5% buff, giving you a limited number of turns to take down the Flying Shrine Maiden before she becomes too powerful... though you have quite a bit of leeway here, especially compared to her Abyssal form (who, at 10% buff per turn, only needs 10 turns to hit her peak).
It's not as hard as you'd think, since Reimu loses her support skills in this phase (i.e. no more obnoxious buffs or heals). The big drawback is that you actually have to deal with Shining Arrows from the Sky (which really hurts). Things got dicey for a moment, but since it's only one boss, I managed some switching shenanigans with Suwako.
For this version of the fight, I had some different characters:
Chen: I had her specifically because I wanted an Oracle. I forgot in the run that Reimu doesn't actually buff herself once Marisa dies. Doesn't matter too much, Instant Attack is still really good for support / character switching shenanigans (I'm also 90% sure that the Fantasy Seal dodge near the end was only possible with the Yakumo synergy, so that's nice)
Eirin: It might be excessive, between Miko, Sanae, Kasen and technically also Ran, but Shining Arrows is really scary. My prototype strategy for this fight was Miko, Sanae and Eiki but Kasen ended up working much better than expected, which is why I dropped Eirin from my final party.
Mamizou: She was added purely for thematic reasons. Can't have a showdown with the Shrine Maiden without the Tanuki Chief herself! ...yeah I didn't really have a good reason to put her here. I guess you could say it was as backup debuffer in case Reisen died, but she also ended up dying lol.
Overall, the strategy I'd worked out in the original video was solid that I got by with little variation between parties. Even with Reimu's buffs and new attacks, I really do think that micromanaging your party around one boss is way easier than micromanaging around two.
Music is "Soaring Over Eight Billion Kalpas ~ Sinful Rampage" from Hollow Song of Birds
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