Inside the life Palace, the projection of Ye Futian's consciousness stood before the World Tree of his Natal Soul. He seemed to be pondering something.
Since he started cultivating, nearly everything revolved around his World Tree. By meditating about it, he derived the other sub-Life Souls. This was only possible with the World Tree because this Natal Soul could accommodate any and everything in this world and provide endless energy for him.
For instance, if he devoured the extreme powers of the Yin or Yang, he could extract them and convert them into his own power. The World Tree absorbed all powers in the world, but it also reciprocated Ye Futian with the purest of Great Path powers.
Looking back, without the World Tree of his Natal Soul, none of the other things could have existed. This World Tree was a divine tree, and all other Life Souls and Great Path powers were the fruits borne on this divine tree.