The mythology of creatures in Heroes (Goblins and Co.).

If we delve into Scandinavian mythology, Jarls were simply rulers and shouldn't be depicted with any specific weapons. The shield-bearers are portrayed accurately, and the shield wall is indeed described multiple times in the Elder Edda (Scandinavian epic). Javelin throwers also existed, but the idea of land-based harpooners is inaccurate. There were men with javelins, but they simply had spears with barbs, not harpoons. There were never riders on bears – that's a fantasy. As for Arcat priests, that's a stretch; in reality, the shamans among the Vikings were the Völva and Vedr.