Walkthrough:
Choose Rosa as your character -To unlock, beat 3rd Climax.
Equip 2 accessories that won't stop Witch Time, or don't have any equipped at all.
The fight part of the fight is just dodging, learning his move sets, and countering by dodging/Witch Time. Dodge his attacks to activate Witch time and PPP HOLD to get reliable damage on him. PPP HOLD can also attack from afar to keep space between you.
Once you deplete 1 1/3 bars of health, he will transform.
During his transformation, equip the "Bracelet of Time"
At the start of demon Rodins fight, you should have about 2 full bars of magic. Manually activate Witch Time to PPP HOLD and dodge swiftly after Witch Time ends. Rinse, repeat and you should have a dead Rodin.
Your reward for doing this is the Rodin weapon, A weapon that turns into every weapon in the game through combos.
Hope this helps and good luck!
