Goblins were a massive problem for a while after the Elder Age, until the forces of the Abyss outstripped them. Originally forest dwellers, they were ousted by the elves to the savannah plains between Orn and Barmondel during the early Days of Grief. They also settle in the foothills of adjacent mountain ranges.
The meager life in the savannah, without access to rich natural resources, has sharpened their senses and forced them to become crafty and inventive. They gave proof of that during the Goblin Wars.