Steppe nomads leading their herds around. Their only settlements are the temporary camps they set up around their pastures, which they transport in wagons. Horse riders, they love their horses, but griffon-drawn chariots are their biggest prestige. Owning horses, wagons, chariots and griffins is a sign of wealth and status, while they don't really care about money. They know how it works and how to trade, but actual things are more valuable to them.
They worship the moon, the sun, various winds and rivers. They don't anthropomorphize them and find that a very human and strange tradition. Instead, they worship the natural world, not because they expect anything from it, but because it deserves prayers. However, they believe in the power of song and that certain rituals can affect fate. Contracts are formalized in songs and rituals as well, which results in breaking deals being seen as sinning against the worlds order.
Their warlike nature (head-hunting is a common pastime for them) leads to an overabundance of women compared to the men. Therefore, men can have large harems, but the first wife is always the most important for rites and status. Men are expected to perform great feats for them to prove their worth.
They don't have any writing. Instead, they codify anything in songs. Books can be lost, but songs remembered by the whole tribe are forever. Their deedsbecome epics on their own, and often contain insults at other tribes. Fights between tribes can start with literal rap-battles.