Six lizard tribes, including more than 70,000 members, had pledged loyalty to Lin Yun. A minotaur tribe voluntarily pledged loyalty to him for food. There was also a tribe of dark dwarves, who had pissed off the Blood Elves, and had to escape here. There were altogether five underground races that served him. But the Cave Gnomes and the Red-Skinned Spirit Suckers had the privilege of being sent to the Natural Demiplane.
The lizards, minotaurs, and dark dwarves were all left in the underground world for exploration, investigation, and collection of resources. That was the work which required natives of the underground world.
Lin Yun set up a base in the Tungus Mountain, where he'd found the Cave Gnomes at the beginning. It was nobody's territory anyway, but rather a buffer zone of multiple races. Also, the place was not rich in resources at all, at least not in the eyes of underground creatures…