Astlibra Revision Postscript Boss Four Braves on Impossible Difficulty

I focus the Cleric and the Warrior first. The Warrior kinda follows me all the time, so damage to him is mostly incidental (In fact, on the first attempt I defeated one of them, I tried focusing entirely on the Sister, and the Warrior died on the same hit). I'm not focusing the Cleric because of his healing (I out-damage it anyways, so it doesn't matter to me), I focus him because in all the other attempts where I would leave him for later, I just die to his swinging (I suck at dodging his predictable move for whatever reason). All the other characters have better telegraphed moves I can easily heal off of (the Warrior's charge, the Sister's vertical beam, the Archer's arced arrows (better to just swat them out of the air though). Those all have really long wind-up that are easy to see). Also, I somehow once defeated him within the first two casts of dark magic, which is what lead me to spam dark magic.
The Sister and the Archer on their own don't present much of a threat without the Warrior chasing you around. I focus the Archer here because I previously died from carelessly being stunned doing it the other way around.
In summary, I went in order of: Cleric 〉 Warrior 〉 Archer 〉 Sister.
I imagine this boss would be troublesome for many players, since it's the only one with four different, distinct entities to fight (excluding arena fights).
Excuse me fiddling with the menu at the beginning and end. For this attempt, I figured I could optimize for dark magic at least a little bit since I'd be spamming it so much. It seems this boss took me just under an hour to beat.
Recorded on Nov 28, 2022.
Trimmed from my own playthrough on impossible difficulty, so don't expect a proper showcase/walkthrough/guide.
0:00 Start
0:47 I stop fiddling with the menu
3:26 (1/4)
4:11 (2/4)
5:04 (3/4)
5:54 (4/4)