“The shop is called The Marginalia Vault, a narrow three-story magic shop wedged between a university archive and a lecture theater. Its windows are tall lancets of blue glass, and every pane is covered with equations that rearrange themselves whenever a bell rings across campus. Inside, shelves climb to the ceiling and move along brass rails when the owner pulls a chain. Scrolls are arranged by spell level, school, and degree of academic controversy. A reading balcony circles the upper room, where customers may study approved scrolls under supervision. The air smells of dust, lavender, hot wax, and ozone. A brass bell rings whenever someone removes a book without signing the borrowing slate. The proprietor is Professor Ilyra Venn, an 8th-level human abjuration wizard with ink-stained fingers, silver-threaded black hair, and spectacles enchanted to display faint protective auras. She wears layered university robes reinforced with discreet leather panels and carries a wand made from a broken lectern leg. Ilyra is patient with genuine students, suspicious of collectors, and openly hostile to anyone who treats magical research as a shortcut to power. She knows the names of most faculty members, remembers every unpaid debt, and insists that customers explain the intended use of any scroll above third level. Her invisible servant, Errata, rearranges stock, rings warning bells, and occasionally writes sarcastic comments in the margins of customer receipts.”