According to Master's exact words.
This method of torture is almost impossible for anyone to withstand.
If someone can endure it, it means the needles weren't thick or long enough, or the nerve toxin applied wasn't potent enough.
Of course, there are exceptions in cases where someone possesses an extraordinarily indomitable will, like a Death Soldier.
If that's the case, Plan B is initiated—extract the soul, then summon Master to personally perform the Soul Searching Technique in a secluded location.
Naturally, the extracted soul cannot be brought to Longevity World.
What if remnants of their soul's aura remain in Longevity World?
What if they utilize this to perform soul tracking and discover Longevity World's location?
Although Lu Changsheng has set up dozens of shielding arrays across Longevity World and applied spatial formations that could move Longevity World as a whole at any time.
Still, Lu Changsheng isn't someone who would gamble even a million-to-one chance.