Feng Jun conducted animal experiments for a full ten days.
During that period, he had someone buy a large vat and tossed Jie Chaoqun's corpse into it, sprinkled it with corpse-dissolving powder, and after the body had completely dissolved, he took the vat to Mount Zhige and dumped both the vat and the corpse fluid into the river.
After a week of animal experiments, he had basically mastered the skill of taking living creatures through different planes.
However, that was only limited to livestock; he hadn't been able to figure it out with humans yet—the test subjects were hard to find.
The most crucial point was that there was a huge difference between taking ordinary people and taking cultivators who have reached the out-of-dust phase, which required slowly exploring the rules.
But Feng Jun was not discouraged, for he had grasped one rule: if the energy points weren't enough, he couldn't bring people through!
If he couldn't bring people through, he couldn't enter either!