A guide on completing the Razmi sidequest that make them stronger, and in some cases unlocks their fourth costume / color.
Requirements: Access to Mount Sumeru, Sky Splitter.
After you have 5 bars of Iddhi, you can talk to Razmi in your inner realm, and she’ll mention that her tiger Bom is dying, because he’s been locked up with a monster’s soul. Take Razmi to the Tower of Wisdom and talk to Angwhu, who will give you a spell to summon the monster so you can kill him for good.
Once you have the spell, head to Mount Sumeru, and go to this point on the map:
Getting there is a lot easier the more mobility upgrades you have, but the bare minimum is the Sky Splitter (plus several other things you are required to have before getting the Sky Splitter).
Once there, a cutscene should start automatically. Fight the monster with Razmi in your party and the rest will happen automatically. Razmi is now much stronger!