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!Lost Library
New Structure: The lost library generates underground. It has a lot of bookshelves, maybe some are salvageable? Also has anvils, a lodestone, a smithing table, and a potion station.
Spawns using the #is_overworld tag, so should be compatible with anything. Uses stronghold library loot, so changing that will change the loot that appears in this structure.
REQUIRES COMMAND BLOCKS

Ancient libraries lay buried, forgotten by time. Magic books are abundant.