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The Precious Solitary Tome Collection Room, as the name implies, needs no further explanation. Those that are collected here are, for the most part, quite important historical originals, or some Spirit Energy Tomes that have a special structure and cannot be fully replicated.
In terms of the phrases used during the Lost Epoch, these would probably be called magic books, or magic guidebooks—in short, what's truly important about these books is not their content, but the peculiar Spirit Energy attached to them.
In theory, Ian could also visit the Precious Solitary Tome Collection Room.
He had the access pass and a letter of introduction from an Alchemy Master; staying for a brief half hour was completely no issue, not to mention he had directly scanned with the Silver Chip.
But to rush to this place on his first visit to The Grand Library would have been somewhat overly eager.