Duration: 1:09:42

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2

Lithos used for 1st phase, Patchouli for 2nd and 3rd.
Lithos' Commander was Marisa, Patchouli's was... Byakuren I think. Her or Nitori since I kept switching between the 2.

I could have beaten all with Patchouli, but for my sanity, I decided to count each phase as a different boss. Besides, this still technically fits rule 1.

Note about Indigestion:
It does damage based on your Resistance, but it can't kill you unless you're at 1 HP, so I focused on killing every spawn so they couldn't snipe me after one. Using the same thing as the Abyss Dragon, I went until the summon limit was hit. That way, it was just 1 on 1.

(Spoilers below rules. Don't read until after the end)

Rules:
1. Only 1 character on the field
2. Commander is available
3. No character can be used for 2 fights in a row (commander not included)
4. No over-leveling (if you start getting less exp from the boss stage, stop training)








Spoiler Explanation for the ending:

So there's a spawn limit on things. You saw in the Abyss Dragon that the Embodiment of Hatred stopped spawning after I killed a lot. This abuses that mechanic. Second phase, the mirrors are summons and can summon more things. Patchouli killed so many things, the mirrors couldn't summon anything else after a point. As an added feature, the mirrors couldn't respawn. Now the interesting thing about this boss is that each phase counts as a summon. I think that should explain the 3rd phase. They were out of summons, so they couldn't spawn the third phase.

:)