Ashurbanipal

Ashurbanipal is the grand library of the Great Tomb of Nazarick in Overlord, occupying part of the tenth floor and holding the tomb's collected knowledge. Most of its shelves carry summoning books, the volumes needed to call up mercenary monsters through a ritual and a payment of gold, and the guild that built Nazarick duplicated those in enormous numbers on purpose: the mass of ordinary books hides genuinely valuable magic items among them, so that anyone who is not a guild member or a servant has no way to find anything. Beyond the summoning texts, the collection covers event items required for class and race changes, cosmetic skin data for weapons and armor, and shelves of fiction, including works written by YGGDRASIL players themselves.