The Source Gu was the origin of all gu insects.
There were so many Immortal-Eating Gu in this Secret Realm that controlling the Source Gu would be tantamount to possessing an army of gu insects.
And an army of Immortal-Eating Gu at that.
"If this Immortal-Eating Gu's Source Gu has surpassed the human immortal realm, we'll be in trouble."
"With the Yin-Yang Life-Death Stone lost, the only way out of here is through the Space Gate or the Immortal Defying Token."
To secure a clear path of retreat, Lin Fei waved his right hand and tried to open the Space Gate.
Whoosh!
The Space Gate opened smoothly, completely unaffected.
This allowed Lin Fei to breathe a sigh of relief.
"I can't use the Immortal Defying Token lightly. I still haven't found nine spiritual veins. Returning to the Immortal Selection Ground would mean failing the fifth trial."
Once he returned to the Immortal Selection Ground, getting back to the Dark Starfield would take so long that he would already have exceeded the hundred-year limit.
But the Space Gate could only be used within the Secret Realm; it could not take him back to the Southern Heaven Continent.
Even if he came back again, he would still be trapped in this Secret Realm.
If he could neither subdue the Source Gu nor recover the Yin-Yang Life-Death Stone, he could only leave through the Immortal Defying Token. That was his last resort.
"Let's see how strong this Source Gu is first."
Lin Fei closed the Space Gate and put away the Ten Thousand Bat Patriarch and the Tang Family's two void insight realm Corpse Puppets.
With Dongfang Qingcang, a human immortal realm expert, beside him, his safety was assured.
"Dongfang Qingcang, have the Void Shadow Demons scout in this direction."
Following the direction