Oyster Shell

The dropped item from the Oyster Shell is volley TN: ボレー Is it bird food?

The volley is the usual drop, and oyster is the rare drop.

chapter-111

Does anybody know what volley actually is? What is the japanese? How is it related to Oysters?

Answer:

The full term in Japanese is ボレー粉 [ぼれいこ] (“volley”, or oyster shell powder)

ボレー粉 is finely-crushed oyster shell, and is used in Japan as bird feed (it’s rich in calcium and is thus good for female birds just starting to lay eggs, so it’s probably good for Vesta’s bones or something)

Further reading:

https://inko.exp.jp/2019/03/08/post-8189/amp/

https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q14130351864