Soloing A Spirit Beast with a Mirage Spirit

[It is similar to another type of energy called Dark Energy, but it is a minor version. Probably the mix of the spirit power and the demonic energy.] The system explained. [The real Dark Energy can instantly corrode anything's mind and body. You can think demon energy is also born out of it or a weaker version.]

{Dark Energy? I haven't heard of it before.} Yuan thought. {And so powerful?}

[Of course, you wouldn't. Because it shouldn't exist in this world.] The system said after a moment of silence. [And sorry, I can't explain anymore.] 

{...Ok.} Yuan thought. {But I need to think of a way to stop her from doing anything. I am sure she already took control of the gorilla. She used the elder as a distraction. She is really cautious. If not my soul power I would have been left in the dark.}

[Yeah, that's one scary opponent.] The system agreed.