A key shaped like... a trilobite?

In-game description

Trilobite Key IV is an item in the MARDEK series.


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For quest Opens the fourth locked door in the Trilobite Cave (B3 to Cambria).


In shop Aeropolis Antique Shop (if not obtained in Chapter 2)
Misc. Talk to Gope in the Goznor Inn in Chapter 2, provided you didn't kill him in the Gem Mine.
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