Ple-Sen
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What unread books are left there?
Shen was reading a book about the eighth valkyrie.
Linderia is going to read a book about the second valkyrie, but we don't know what the effect is yet.
All the other valkyries (and a few idols, but those are only for Artherian bonuses) are untouched.
Added 1 minute ago
What if it's not for me? Maybe demons live there...