"A Shrine of Depths? You mean those ancient shrines? What are you looking for one of those for? Not to mention there are plenty of monsters around them, but those seals can't be opened, can they?"
Hearing what Yae Sakura and the others were looking for, Yoimiya looked thoroughly puzzled. No one went looking for those things anymore. It wasn't as if no one had tried before.
After all, legends claimed they contained treasures left behind from ancient times. Quite a few adventurers and Treasure Hoarders had set their sights on them, but even after finally finding a Shrine of Depths, they could do nothing against its seal.
Hundreds of years had passed. No matter who tried or how many methods they used, they could not open one. No one had ever successfully broken a Shrine of Depths' seal, and over time, they had simply been forgotten.
And because of the unique environments around Shrines of Depths, plenty of monsters, Hilichurls, and Slimes gathered nearby...
"You don't need to worry about that. We naturally have a way to open it."
To open a Shrine of Depths, one needed a key capable of unlocking its seal. Without finding the key, it naturally could not be opened. The seals on these shrines were probably connected to the ley lines.
Even after hundreds of years, the strength of the seals had not diminished. They could not be broken by force. Probably...
This thing had waited for so many years, as though it had been left specifically for Lumine. But now that the system had rewarded her with a key, she would be taking one Shrine of Depths from Lumine before she arrived in Inazuma.
"You actually have a key that can open a Shrine of Depths? That really is surprising! How about this?