This was his spirit root.
Before he got teleported, he was a Sword Mortal.
Sword Mortals had the ability to carry the disposition of a sword; sharp and unrelenting.
However, one's true power did not depend on your cultivation, but your cultivation technique.
Ren Qian had, by all means, the best cultivation technique from Ren Jingjing (Or so he thought).
This cultivation technique, the Advanced Rootform Technique gave him a strong foothold in cultivation.
However, there was another use of the technique.
When one's soul was severed from his body, their spirit root would reside in his soul and become their soul roots. In this way, they could cultivate their souls until they found a suitable body to permanently reside in. It was quite common to cultivate the soul, but it was nigh impossible to cultivate the soul outside the body.
The Advanced Rootform Technique had such an advantage but since not many knew about it, this 'fact' stayed that way for hundreds and thousands of years.
Suddenly, Ren Qian thought, 'Where do these islands get their energy from?'
With this thought, he didn't know he had opened the door to spirit cultivation as a soul using the special technique his beloved Yue had given him to survive in this reincarnation (Of course, he didn't know this because he had lost his memories).
Outside his soul, streams of green-colored energy rapidly gathered around him.
Meanwhile, Ren Qian's desperate attempts to find soul energy proved futile. However, he was quite satisfied with his findings.
When he opened his eyes and saw green coloured energy circling around him, he was taken aback, however, his gut feeling told him it had something to do with the islands.
He looked carefully at the green energy, but he could not find any anomaly.
He looked at the surroundings and the dense green forest was nowhere to be seen. It had turned into a bunch of shriveled plants.
Ren Qian was suddenly struck by an epiphany.
This meant the energy was sapped from the surroundings.
He then began to study the green energy. The closer he looked, the more familiar he felt. This made him joyous because, it seemed his past life was closely linked to this energy.
Subconsciously, he began absorbing the energy.
Ren Qian was in dismay, seeing the energy enter into his soul.
What exactly was going on?
Before he could process his thoughts, he felt a peculiarity.
He had thought that the energy would go straight to the green island in his soul since it was green.
However, the energy took a certain path within his soul. He felt it course through him and every inch of his soul experienced a tingling sensation.
Something told him he needed to memorize the path of the energy so he closed his eyes and began to 'follow' the pathway.
It first pushed through vessel-like structures within his hand then all through to his head and finally down to his legs.
This circulation went on for about five times.
And though it seemed easy, the path along which the energy travelled was clogged with impurities and it had to be purged.
After the five circulations, the green energy became golden white and flew into the island in the middle within his soul.
It went on till the energy was completely refined.
However, he didn't feel any different like he had expected.
He looked around for anything else but since he didn't find anything of importance to him, he jumped through the crack that had appeared on the land for some reason, betting it all on fate.
Thankfully, he succeeded in getting away by using that crack.
He found a spherical body staring back at him, located about ten miles away from another domain.
Looking closely, a world could be seen within that body and surprisingly, when he looked through, his eyes widened.
It was the same place he had been kept for hours, where he had discovered the green energy.