The reason why Lei Zhen couldn't locate the last link was simple. The mysterious man purposely hid the last link underground and used a different source to sustain it.
However, no matter how meticulous he was at building his insurance, it couldn't escape Omnivision detection.
Since the last link was underground that was directly beneath the source, Lei Zhen decided to destroy the three other links first.
That way, the last link would be the last one needed to destroy and he could utilize his crowd control skill to stall for time.
It was a risky play, but without risk, how can one gain anything?
'Alright, let's get to work.' Lei Zhen slowly retreated sideways. With the grasses placed on his clothes, he remained camouflaged.
And when he was out of sight of the monsters that were spawned, he quickly started to run toward the end of the first link.
The first link was near a tree root that was covered in leaves, most likely done by the mysterious man to try to hide the link.