Ysterra is not one world in any meaningful cultural sense. It is many — often separated by oceans too violent for reliable navigation, by mountain ranges that took generations to cross, by deserts and wilderness that swallowed entire expeditions whole. The civilizations that developed across its continents did so largely on their own terms, producing an extraordinary range of customs, traditions, languages, beliefs, and ways of organizing daily life that share no common ancestor and owe no debt to one another.

Every culture on Ysterra has contended with the same long seasons, the same triple moons pulling at the tides, the same binary suns painting the skies. This connection by a shared condition has allowed them, in their own way, to build unique events and pastimes for marking the passage of that time — for celebrating survival, honoring the dead, competing with one another, and making meaning out of the difficult business of being alive in a world suffused with magic.

This section of the guide documents those systems where they are known: the games people play, the festivals they keep, the crafts and practices that define communities from the inside. It is not a comprehensive account — no such account could exist for a world this large and this varied — but a collection of windows into lives that are, in many cases, beginning to become visible to one another.