In Deathworld 3, Jason invites those Pyrrans who cannot adapt to the changes on their home world to colonize "Felicity", a planet rich in mineral wealth, but home to humans who are divided into two primitive societies, reminiscent of early Asia. One is an agrarian society living in towns and cities; the other is composed of nomadic clans that constantly fight amongst each other, strongly reminiscent of the Mongols before they invaded China and settled down. The two are divided by an impassible, miles-high, continent-spanning cliff. Most of the warlike clans have recently been united under a wily leader calling himself Temujin.

Jason tries to infiltrate the warrior society and use his Pyrrans to wrestle the leadership of the clans away from Temujin, but is unmasked as an off-worlder and thrown down a deep cave. He survives the fall, landing in a bank of snow and finds that it is a passageway through the cliff. Jason changes his plans and contacts Temujin, who takes him for an unkillable demon. Jason offers the barbarian leader his greatest wish, to conquer the rest of the continent. Temujin does indeed prove unstoppable, but is perceptive enough to realize, at the peak of his triumph, that he has to pay an enormous price for what he has won, as his people are becoming corrupted by the easy life of civilization and will forget their nomadic ways.