This clear uses Red XIII's 10-stack mirage move to cheese the boss' physical attacks. The average damage at turn 8 seems to be around 5.5~6b damage. I gave Red guts and cast reraise on him for safety, but some runs may be ruined by rng because the boss uses a LOT of physical attacks. - Turn table: imgur.com/a/b7NPbWF
Chow is the beast killer buffer and secondary dps unit of this clear. There's no exact alternative, but other dps (Hyoh with Ang's imbues, Zyrus) would probably be able to fill in the role even without the beast killer. I'm not sure on the exact rotation, but if you're replacing Chow don't forget to have Ang imbue himself with water! Also, Melissa is an extremely big upgrade from NVA Elena, and will take care of the beast killer buff if you can fit her in.