From the post:
Long ago, in a time now consigned to myth, the Uthuk Y’llan traded their souls for power and made allegiances with the fell demons of the Ynfernael. Their foul armies swept across the lands like locusts, destroying all in their path.
In desperation, the people of Mennara forged an alliance against the demonic horde. Their united armies crushed Llovar’s forces, driving their shattered host back beyond the Ru Steppes and into the Darklands where they would surely wither and die.
But they did not die. And now, after a thousand years, the Uthuk Y’llan have returned.