Lin Yun had researched the situation on Earth via the Cosmic Trading System.
Some lifeforms emitted a lot of Spiritual Energy, which generally happens under three circumstances.
First, these lifeforms were very powerful, with strong souls.
Strong souls meant powerful Spiritual Energy, and they naturally emitted more Spiritual Energy than others.
Second, these lifeforms had great potential, absorbing energy from the environment and converting it into Spiritual Energy at a rapid pace, but they didn't know how to integrate this energy into themselves, and so they naturally emitted more.
Third, these lifeforms were special, absorbing energy from the environment and converting it into Spiritual Energy at an exceptional pace, but they found it difficult to integrate this energy into themselves, so they emitted more Spiritual Energy.