Culture is an additional axis, compared to vanilla 5th Edition. In a world where nations are not typically isolated enclaves of a single species, there are often many different ethnic groups and species making up a single culture. Cultures confer additional benefits, stacked on top of your core traits. It's advisable to choose this early on, as it provides inspiration and flavor to you as you mold your character from raw imagination. Also, it allows you to maximize the benefits by not "doubledipping" on bonuses.
At this time, almost all gameplay in the Sundered Realms is focused on the Continent of Thrask. The Cultures here are primarily drawn from this continent. This is a complete list of what has been created, but not the upper limits, many smaller regions, areas and nooks and crannies remain to be catalogued, so if there is something a player wants to play or see that better fits their vision, Hopper will do their best to work with you to build that together. The summaries of the cultures include the primary demographics as well as any restrictions. These demographics are guidelines, and most PCs can be from anywhere.
Telosian Elected Monarchy, Primarily Human, Elf, Firbolg
Yorgen Plutocratic Republic, biggest city on thrask. New York inspired.
Cultures in Nearby Regions:
Keldish Tribal Elected Monarchy, Primarily Human, Goliath
Greckan Corsair Loose alliance of Corsairs, Pirates and Armed Merchantmen. no direct influences. Boven somewhat uncommon, no other dominant demographics.