The bead was a special type of Spirit took called as the Void Tracing Bead.
It was able to sense the Spatial disturbance by sensing the traces of spatial energy that usually came from the void. Whenever there were spatial disturbances, a faint amount of energy from the void would leak into the world.
This was often too small for a normal cultivator to sense and thus many people would just miss it. The same could be said for Lin Wu too as his spirit sense was unable to pick up on it.
But the system was a lot more accurate than that and wouldn't miss any signs. And thus it had recognized it quickly and marked the results on the map.
And now that Hu Dagao had used the Void Tracing Bead, it was proven.
~HUMM~
The translucent white bead trembled in the man's hand before flying up automatically. It hovered in the area where the traces were the strongest and changed color. From a translucent white color, it became a light grey instead.
Seeing this, Hu Dagao furrowed his brows.
"What does that mean?" Lin Wu questioned the man.
"The Void Tracing Bead will change color depending on the level of spatial disturbance that is caused. Grey is the lowest level of it." Hu Dagao answered.
"The lowest level? Hmm… I don't think people would be pulled into the void at that point." Lin Wu said after thinking for a second.
"Yes… such level of spatial disturbance are not uncommon. But there is certainly no way for someone to disappear. At least not so many people." Hu Dagao confirmed.
"Let's check the other areas then." Lin Wu brought Hu Dagao to the different spots one by one.
But no matter which spot they checked the results were the same. Only the lowest level of Spatial Disturbance was found.
"This is wrong… how can people disappear despite it being such a weak disturbance? Even the remnant distractedness from a heavenly Tribulation are several times stronger than this." Hu Dagao said feeling confused.
Lin Wu could understand his confusion and asked the system to widen the scope of search.
'There were tremors too right? Perhaps there is something underground?' Lin Wu let his spirit sense enter the ground while the system also scanned again.
For five minutes, there was no change. But then finally, the system detected something.
~DING~
——
NOTIFICATION: Spatial disturbance detected!
MAP: Updated!
——
Lin Wu looked at the map and changed to the underground layer on it. There he finally saw another site of disturbance.
"No wonder it wasn't detected earlier… it's over four kilometer deep underground." Lin Wu muttered.
At this point, most experts with strong spirit sense would also not sense it. After all, the deeper one went, the harder it got to use spirit sense.
'System, is the disturbance on the same level as here?' Lin Wu questioned in his mind.
~DING~
——
ANSWER: The system cannot accurately judge it, but preliminary assessment shows that it should be stronger.
——
'That's all I needed.' Lin Wu turned his attention to the ground and directly started digging.
~TREMBLE~
Hu Dagao was taken aback and was sacred. He saw Lin Wu's move at a very fast speed and directly bore through the ground. In just five seconds, his entire body had already entered the ground.
'What is he doing? Is he leaving me?' Hu Dagao wondered as the hole got deeper and deeper.
After a minute, he couldn't even see Lin Wu in there, only darkness. But then about five minutes later, he heard a voice in his mind.
"Come in, I found something more." Lin Wu ordered Hu Dagao.
"Coming!" Hu Dagao didn't hesitate and directly jumped into the hole.
Even if it was dark and deep, the man didn't care as he knew the true danger was Lin Wu himself. And neither did he think that Lin Wu wanted to harm him in this way, as there were far easier methods of doing that.
Hu Dagao continued to fall and reached the bottom of the hole in less than a minute. Since he was a peak Dao Shell realm expert, he wouldn't sustain any damage from a 'fall' like this and could just slow down before touching the ground.
"It's dark…" Hu Dagao squinted his eyes.
~SHUA~
But then in the next moment, a green glow illuminated the entire area, allowing him to see everything. The green glow had come from none other than Lin Wu after all.
Hu Dagao looked around and discovered that he was actually in a large cave system. He could tell that it was a naturally formed cave and wasn't made by Lin Wu right now.
~drip~drip~drip~
The sound of water dripping could also be heard and Hu Dagao felt the moisture in the air too.
'There's probably an underground river here.' He thought to himself.
"Come over, it's here." Lin Wu said calling him to one of the caves.
Hu Dagao ran towards there and soon felt the Void Tracing Bead tremble again.
~SHUA~
It flew out of his hand and hovered in a specific spot.
~humm~
Then a few seconds later, it started to change color. And when it did, Hu Dagao's eyes went wide.
"R-red… it's red…" Hu Dagao muttered in astonishment.
"What does red mean?" Lin Wu asked the man.
"Red… is the second highest warning level. If it is at this point, it means a portal to the void was opened here. There is only one level higher than this and that is the black level. At that point, it just means a crack in the space has appeared." Hu Dagao answered while feeling anxious.
"I see…" Lin Wu felt like he had come across a large clue.
'Let's check it in detail shall we?' Lin Wu gave out an order to the system.
~RUMBLE~
And when he did, hundreds of runes flew out of his body, directly imprinting onto the air.
Hu Dagao who saw this was stunned.
'What is he doing?' He wondered, but then five minutes later, his jaw fell open.
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