If you don't keep trading so you can get good equipment, Diva No. 5's final boss can be quite a bit more challenging than this. Ameya is just too good, probably the strongest main character with her kit assuming she has Vermillion Sands.
I didn't get to visit Pulchra in my Diva run and my Ameya isn't that strong. I guess I had the "hard mode" 😂 Delores and Boudica were my MVPs. I ended up winning on a Delores showtime after she survived Emerald Union and her fire resistance let her survive that flame sword move.