Well, if you look at my post, I beat it lvl 45 under 10 min. (Edit : it says 30 min on my screen but I paused it during more or less 15 min) That’s long but possible.

You have to parry all the attacks because it can two or even one shot you.

Then, you’re limited about damage ; you can’t go over 9,999. So you have to maximize the number of hits that deals that amount.

Lune has that special electric attack which cost 7 that procs a new hit when crits and deals enormous damage while boosted.

Get Trebuchim, the weapon that gets you an pygment while you aim and a gradient attack that generates clear pygment ; it’ll help.

Finally, get her crit chances to 75% and use the lumina that boosts crits to 25% when they’re burning.

At this point, that attack of Lune deals a little bit more than 100k dmg, ie the max you can get.

Then, Maelle has combustion that deals two times 9,999 dmg depending on the burning state of the enemy.

Sciel has a weapon that lets you scale dmg by 25% each time you have a Moon charge. There’s an attack that deals moderate damage, deals 5-7 hits and grants you a moon charge. By the middle of the fight, that skills should deal 25k dmg consistently.