The problem lay with the technique itself!
Like certain other techniques, this one had an inherent chance of success. It was not guaranteed to work every single time.
Moreover, this technique could control at most one demonic beast.
If a later use of the Spirit Control Technique succeeded, the previous use would immediately become invalid!
That was why, out of Wei Suo's four attempts, only two had succeeded. And after the later attempt succeeded, the earlier Heart Devouring Worm Egg had turned into a dead egg.
No wonder this Spirit Control Technique was so simple to cast and had so few cultivation requirements, yet had not spread widely throughout the Tianxuan Continent or been safeguarded by beast-taming sects.
Demonic beast cubs above Level 4 were precious to begin with. After finally obtaining one, who would gamble on a technique that was not guaranteed to succeed?
Even Wei Suo, if he obtained more Heart Devouring Worm Eggs, would certainly still do everything he could to acquire other techniques for controlling demonic beasts.
This Spirit Control Technique, which was no different from gambling on luck, was simply too useless.
Wei Suo had originally intended to raise five Heart Devouring Worms by himself.
If he could advance all five Heart Devouring Worms to the level of a Heart Devouring Worm Elder, killing two or three cultivators like Wen Daoge would be as easy as turning over his hand.
But now Wei Suo had controlled only one Heart Devouring Worm, and it was the weakest among the five unhatched worms. Han Weiwei, on the other hand, had controlled the strongest one.
How could that not make Wei Suo's expression turn utterly grim?
Wei Suo now had only two choices. One was to effectively give this Heart Devouring Worm to Han Weiwei; the other was