Okay im pretty sure the Berseria combat design is just taking the piss at this point. This optional boss monster reflects all damage. The only way to defeat it is to reflect its own attack back to it and the game helpfully provides a chest with a ring that does that right next to the boss.
Problem is. It's a 5% chance to reflect. I have been taking hits waiting for this to proc for 30 minutes and it has not happened. I checked online to see if I'm doing something wrong and no I guess that's what you have to do.
You're lucky you have a good story Berseria because your combat design aggravates me to my wits end.