Our first errand is to obtain Adamantite.

1. Fly to the northeast corner of the Underworld, then interact with the tiny volcano to go back to the surface.
2. Fly to Eblan Castle area, swap the airship, then hook the Hovercraft.
3. Bring the Hovercraft to Mythril island.
4. Use the Hovercraft to access the cave to the southeast of Mythril.
5. Talk to the mini old man and give him Rat Tail. In exchange, he'll give you back Adamantite.
6. Fly back to Eblan Castle and swap the airship again.
7. Go back to the Underworld, then fly to the southeast corner.
8. There, you'll find a tiny house; Kokkol's Smithy.
9. Once you collect the 2 hidden items, talk to the old man sleeping in his bed on 2F. When prompted, give him Adamantite.

Now we just have to wait and come back later for the prize.

Chests/Items:

• I-050: Remedy - 1F, inside a pot in the bottom-left corner.
• I-051: Soma Drop - 2F, on the bookshelf.