Culture names written in the same font are part of the same cultural group.
Adranic = French / Germanic. The culture of the player kingdom.
Polytheistic pantheon, slavery is ok and widespread (they buy their slaves from Duluks and Haegars). Polygamy exists - a woman can have many husbands, a man many wives.
Altanic = Spanish
Polytheists with the same pantheon as Adranics, no slavery but human sacrifices => Nobleborn prisoners of wars, Altanic or any other culture, are imprisoned in a room full of salt with glass walls, and the people watch as they die from thirst. Animals or criminals are sacrificed in times of prolonged peace. Monogamous, but mistresses (and misters(?)) are accepted. Trade very present.
Eldanic = West Slavic
Meritocratic military: any soldier competent enough can become a general with enough patience, although nobles have the advantage of receiving a better education. The oldest of all generals becomes the new Prince (aka King) when the previous one dies. This means there are often leadership changes in their nations, but it also means that they have one of the best officer corps of the world. Polytheists, same pantheon as the first two. Slavery is illegal; they are the sworn enemies of the Duluks.
Haegars = Vikings
Raiders and pirates. Polytheists, but they have their own gods. They burn the bodies of warriors, and bury the warriors who managed to kill at least one Haegar before dying. Peasants are sold as slaves. Best archers of the known world. They are strictly monogamic, women are equal to men, they keep no slaves for themselves.
Duluks = Mongols
Mounted raiders. Polytheists, their own pantheon. Have a strict honor code, universally respected. They sell their enemies into slavery, all except the Duluks.
Saelradians = Egyptians
Republic. The ruler is a God, and his divinity goes from ruler to ruler. The people, the voters, are those who grant said divinity. The rulers who turn tyrant were possessed by demons at the time of the elections.
Ralkarians = Greeks
Decadent and extremely rich, great traders. They do not enforce any religion, and as such there are a lot of different temples in their cities. The richest man in the nation is the ruler - since they control taxes, they have a tendency to remain the rulers for all their lives.
Ampyrians = Arabic
Matriarchal culture. Monotheists.
Selenids = Chinese
Foul mouthed, notoriously dishonorable. Value the lives of their own. Monotheists.