Ymir is a 4X multiplayer strategy game combined with a city builder where each player develops a civilization of pigmen starting at the stone age. On one hand you have to govern your state : colonizing new lands, securing resources, dealing with your neighbours, choosing civics, discovering technologies, waging war.. And on the other hand you have to organize your cities : creating fields, houses, industries, defences, managing your population, your resources and your armies... Ymirs relies on an economic simulation more than a set of abstract game rules. Your society is divided in social classes with a dynamic incomes and wealth, depending on the resources they produce and sell at dynamic prices based on offer and demand. It's also a game of diplomacy between players. With a wide range of diplomatic treaties, you'll be able form federations of players, or empires centralized around a single king. You'll be able to setup permanent trade routes, taxes, tributes and alliances.
In the government menu, a modular system of policies allows you to customize your state.
You can pass economic policies affecting how the economic simulation runs, or power policies defining how the political power is distributed in your state, or even how its legitimated : will you claim to rule for the people, or will you claim to rule because you're a living god ?