Ryu's words made a cold shiver crawl up Zanlis' spine. It seemed to be a pointed, hardly hidden threat.
To Ryu, anything he couldn't control was a problem to his current purpose in life. Why would he risk allowing this Goaman to live if he could be just as if not more useful as a corpse puppet?
The others here couldn't afford to so casually use their corpse puppets. Controlling puppets required a large amount of Spiritual Qi and replenishing it obviously required an even larger amount of normal qi. In this Nether qi dense environment, it was impossible to expect to replenish that qi with any sort of ease.
Ironically, this meant that the strength of these youths, who were clearly all Necromancers, was as much as halved without being able to display their true capabilities. It was obvious that this entire world was pushing them all toward becoming Summoning Necromancers, but only a very selected few would ever succeed.