Fire Emblem Warriors: Three Hopes - The Loop
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Depending on the source, comes randomly augmented with up to 3 the following:
Tenshodo Coffer - Chocobo key
Resale Price: ~600 gil
How to Obtain
- Opened with a Chocobo key
In most languages' meaning of the parent words "stark"/"sterk," it means "strong" (Wikitionary).