I have an idea. Have at least fragile/unbreakable strength, mark of pride, and quick slash. After going through the first phase and scaling the platforms, go to the lower middle platform where Radiance spawns and start slashing. She will stay on that platform for an extended amount of time, allowing you to just wail on her while dodging the occasional attacks. Then all you have to do is hit her a few times, scale more platforms, then deal the final blow. This grind can defeat her in less than 2 minutes, meaning that you can finally take the pic while the lights are off. Idk why I’m posting this at midnight I just have random facts laying on the shelf lol.