The Heritage Vault is a cultural preservation organization of approximately 4,000 members dedicated to maintaining the cultural traditions, languages, cuisines, art forms, and historical memories of the Ubiquitous Diaspora's scattered peoples. In GLMZ, where the population is a blend of every human culture that survived the upheavals that created the city, individual cultural traditions are at constant risk of dissolution — absorbed into a homogenized urban culture that speaks one language, eats the same food, and remembers nothing before Meridian.

The Vault operates cultural centers — called 'Vaults' — in every district, each maintained by community groups dedicated to specific cultural traditions. A single Vault building might house a Yoruba language school, a Japanese tea ceremony practice, a Mexican culinary preservation kitchen, a Maori carving workshop, and a Romani music archive, all under one roof. The centers are spaces where the grandchildren of the Diaspora learn the things their grandparents knew — things that have no economic value in GLMZ's market but immeasurable value in the human sense of knowing where you come from.

The Vault also maintains a comprehensive digital archive of cultural artifacts, oral histories, traditional knowledge, and genealogical records. For people whose families were scattered across the globe and reassembled in GLMZ's melting pot, the Vault's genealogical database is often the only way to trace their heritage — to discover that their grandmother's grandmother came from a specific village, practiced a specific craft, spoke a specific language that nobody speaks anymore.