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If she were to directly ask how to save the Priest, the Booksmith might respond that he doesn't know, and that would spell trouble for her. However, if she asked the Booksmith about everything he knows about the sword, the Booksmith couldn't possibly say he doesn't know.
Because the territory of the "sword" is adjacent to that of the Booksmith, it's possible he doesn't know everything, but he definitely knows some basic things.
As long as the Booksmith talks, it won't trigger his erasure rule.
And since the question is about everything he knows, if the Booksmith knows how to rescue something sealed by the "sword," he would also speak of it.
"Are you referring to the sword located to the southeast?" the Booksmith pondered, and while thinking, he provided his answer, "That's an antique that ran out of the museum when the city first fell into chaos. But the museum did not label its name; it is a nameless bronze sword."