In contrast to this world of relative law and relative goodness, there existed another one - darker and more chaotic - the one of the generally evil and chaotic races of goblins and orcs, and all sorts of monsters and monster races, especially in the underworld. Some examples thereof are orcs, goblins, ogres, evil giants, illithids, and much later - dark elves.
The goblin communities were widely spread throughout the continents of the world, but goblins never possessed the organization and discipline to claim anything more than a fragmentary and inconsequential presence on the political landscape. Mostly suppressed and kept at bay by both friend and foe, they never had the chance to develop into anything more organized and formidable. They would usually make the willing servants of whomever had the minimal force and determination to enslave them.
The orcs on the other hand had much more reason for pride, for they managed to establish a strong and dynamic, if fragmented, culture and political presence, especially in the southern continent. Organized in clans and tribes, the orcs battled constantly among themselves in tribal conflicts over resources and influence. From time to time, a strong leader would rise as a result of the constant tumult and lead a great movement of the orc masses known as Waargh. In such cases, a number of tribes would spontaneously unite as if sensing the right time and the strength of their warlord so that they would go on a rampage of slaughter, pillage, and destruction.
Such events would mostly be limited to the southern continent, but occasionally, a Waargh-Lord would have the foresight and determination to expand beyond his shores. Then his horde would harvest treasure and slaves in the rich lands of the lizardmen in Sssla, the azrac sultanates on the Vij-Azi desert peninsula, as far north as the free halfling cities of the Liskarri hills. As a result of such massive campaigns, some of the tribes and clans of the Orcdom permanently settled in the northern continent and became a constant, if unwelcome, addition to its population. They would usually enslave the local goblins and cause trouble on a regular basis, but would also usually be suppressed and repelled by joint counterattacks of dwarves, elves, and halflings. Some of the orcs and goblins in the northern continent became much more creatures of the underdark and of mountains, as opposed to more hospitable locales, as a result of containment policies adopted by dwarves and halflings.