Empress and Emperor [Merciless • Low Level] 

Challenges:
• Merciless
• No Items
• No Skill Cards
• No Skill Mutation
• Low Level (Mandatory Experience Only)
Personal Difficulty:
Very Easy
Thoughts:
The Empress and Emperor both alternate their weaknesses throughout the fight whenever they cast Paradigm Shift. Fortunately for us these weaknesses always start and change into the exact same things every time you fight them. If you know what they're weak to ahead of time you don't need to wait for Fuuka. I only saw them do three Paradigm Shifts, but these are the weaknesses that I found:
Empress:
Piercing → Bash → Slash
Emperor:
Lightning → Ice → Fire
The only thing keeping this boss from being the easiest yet is the fact that the Emperor can kill with a critical hit. If I'm going to be honest I'm a bit disappointed. This main story boss died on the hardest difficulty, against low level characters, before the two of them could even attack a second time. Hopefully things get a bit more challenging. The swap to Omoikane at the end was just for experience, I wanted him to level up and learn Auto Rakukaja.
This boss had a substantial amount of dialog after the last possible place to show my character / persona information. To help with that I increased the game speed by 10x to get through it faster. Since the audio is normal it's hopefully not too bad, but I apologize for those that dislike it. I could have technically edited it in before hand, but I dislike doing cuts in challenge runs.
Chapters:
0:00 Character / Persona Information
1:00 Boss Fight
Graphical Alterations:
Minor lighting, coloring, and sharpening changes via ReShade.