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Grotto Coffer Key
Statistics
Grotto coffer key
A key that opens a treasure coffer in
the Sea Serpent Grotto.
the Sea Serpent Grotto.
Possible Treasure
- 6,160 - 16,719 gil
- Fluorite
Map of the Sea Serpent Grotto**- Moonstone
- Ninja Kyahan*
- Old Gauntlets (SMN)*
* Only available if you have the necessary quest active.
** Automatically received if you do not already have the map. Quest items take priority.
Other Uses
Gobbie Mystery Box: Awards 50 daily tally
Resale Price: Cannot be sold to NPCs.
Treasure Maps
How to Obtain
Cannot be auctioned, traded, or bazaared, but can be delivered to a character on the same account. 
Can be obtained as a random reward from the Gobbie Mystery Box Special Dial and similar sources.
Curio Vendor Moogle
| Price: 5,000 gil | ||
| Name | Rhapsody | Location |
|---|---|---|
| Curio Vendor Moogle | Rhapsody in Umber
|
Port San d'Oria (J-9) |
| Port Windurst (M-4) | ||
| Port Bastok (K-13) | ||
Dropped By
| Name | Level | Zone |
|---|---|---|
| Bog Sahagin (6%) | 52-59 | Sea Serpent Grotto |
| Marsh Sahagin (3.9%) | 52-59 | Sea Serpent Grotto |
| Swamp Sahagin (2%) | 52-59 | Sea Serpent Grotto |
| Rock Crab (3%) | 53-58 | Sea Serpent Grotto |
| Mimic | 55 | Sea Serpent Grotto |
| Blubber Eyes | 55-58 | Sea Serpent Grotto |
| Razorjaw Pugil (3.3%) | 57-60 | Sea Serpent Grotto |
- Please note that the Mobs that drop the key are mainly behind the mythril door.
Source entry: Grotto Coffer Key. Cached on this server on 4 November 2026.