"Dwarves rivalry with orcs and goblins, is nothing new. Not many people know this, but dwarves are one of the oldest humanoid races, far older than humans. I've seen texts dating back to dates i thought nothing intelligent even existed. Dwarves have always been mountain dwellers, as were orcs and goblins. So they consistently clashed, dwarves being more reserved, and orcs being more chaotic. It's just been that way for as long as the eldest can remember."