Very often demi-human racial cultures are criticized for it's unrealistic feel- one dwarven language? one set of customs? Well, this may be right, but only when those races widely populate a very large area. In the Barbaric Frontier dwarves and elves are brought to state of near-extinction, and I really mean it. Few elven communities in the Barbaric Frontier spread among the biggest forests, and that's all. Dwarfs? Well one great underground city-state complex, few 100-200 persons communities spread around whole GroBe Reich. This also applies to halflings, but to a lesser extent, there are make the biggest percent of demi-human population across the known world. Because of that, halfling cultures will be as diverse as human cultures are.