Chests (12):

• Golden Sword (x11)
• Wyvern Claws

1. Just follow the map, it's pretty straight forward.
2. At the end of the dungeon, there is a boss Goldor.
3. Defeat Golder, pick up a key, go back to your ship and unchain it with the key.

*** Now you get your Enterprise back, DO NOT fly over Saronia yet if you want to collect 100% bestiary because you will lose your airship.