The Sacred Katana

Details
Client: Jaucribaix (Near the Captain's Quarters, Norg) [K-8]

Walkthrough
Jaucribaix asks you to bring him the Mumieto, (the sword you get when you first get SAM unlocked) and a handful of crystal scales.
To get the scales:
Kill Goblin Robbers in the Sanctuary of Zi'Tah, they will drop a sack of fish bait.
Go to the lake in the northern part of Zi'Tah Sanctuary. (E-8)
You will see a ???, trade the sack of fish bait to it, this will spawn Isonade
Once it has been defeated examine the ??? to receive the crystal scales.
Go back to Norg and trade the Mumieto to Jaucribaix and he will give you your new sword.

Note: If you tossed your Mumieto, Ranemaud in Norg will sell you one for 30k.

Reward
Magoroku