These plants had the dark Qi that Shen Fei needed.
As the dark Qi was absorbed, its color gradually faded, and it eventually disappeared. Not long after, in Shen Fei's sea of consciousness, the bead of life's light completely disappeared. Its physical and spiritual forms became an ordinary bead, and returned to quietly float in his mind.
Meanwhile, a huge sapling grew in the depths of his consciousness. This sapling was the tree of darkness. The tree of darkness was formed by the condensation of dark Qi. Not only could it devour dark Qi, it could also evolve itself and finally transform into a dark divine tree.