This is part of a first-playthrough guide using the Dragon story arc. It covers both the original PSX version and the 2021 HD remaster, though some place and item names differ slightly in the latter. You can find an overview of the Dragon% path here.
The Quick Version
Place the Artifacts obtained from the previous quest. The Dragonbone Artifact becomes the Bone Fortress, but the fortress isn’t open yet until you help the magic-school students camped out front. Help them mix their potion and the fortress will be open next time you visit.
The Details (May Contain Spoilers)
This is another good point at which to upgrade your gear. If you’ve placed all the Artifacts so far, the city of Geo is likely to have significantly better weapons and armor than the Iron stuff you’ve been working with. Go to the mall on the east side of town and visit the shop with the lyre/harp sign over the door. The vendor sells weapons and armor as well as musical instruments. A new weapon (Lorant/Laurent Silver gear is probably what’s available) will make a big difference in the upcoming fights, and a new hauberk (body armor) in the same material is a good buy too.
When you’re ready, enter the Bone Fortress map location and talk to the magic students in the Village by the Fort. The one in the green robes and hat will explain that they are collecting reagents to mix into potions.
Go to the right and you’ll be at the Cranium Gate. Here, each of the NPCs has a different reagent, which you collect just by talking with them. The first time you visit this room, some of the NPCs will say they’re tired, and you’ll only be able to collect one or two of the correct reagents. When you go back to Village by the Fort, the student will let you know whether you got one (“one is okay”) or two (“we’re close”) of the three needed items.
The second time you visit the Cranium Gate, the tired NPCs have perked up a bit, and you can get all three reagents needed to complete the potion. The ones you need are:
> Faerie Scales from the student in blue at the upper edge of the field
> Spotted Silver Mushrooms from the lavender female Flowerling (the less brightly colored of the two “purple” flower women)
> Star Sparkles from the magenta male Flowerling
Collecting three reagents automatically returns you to the Village by the Fort. The student will mix a potion, give you a small reward, and conclude the quest.