Evil Spirits were not post-mortem Nen, but something between post-mortem Nen and parasitic Nen beasts.
Unlike post-mortem Nen, they could not persist indefinitely or exist independently.
They needed to possess targets with whom they shared a causal connection, then sustain themselves by constantly draining their targets' life energy.
In theory, Evil Spirits could not pose a direct threat to Nen users, but sufficient numbers could change that.
In Chrollo's view, if all the Evil Spirits born from Voodoo Doll could attach themselves to Moyu, it would at least amount to placing a debuff on him that both suppressed his manifestation aura and depleted his latent aura.
That process could keep tormenting Moyu's body, mind, and spirit.
So before accepting death, Chrollo had hoped to see the Evil Spirits transfer to Moyu.
However—
The scene unfolding before his eyes defied his understanding.
Moyu had merely raised his hand in a "No" gesture, and those troublesome Evil Spirits had dissipated?
Even an exorcism ability should have required a process, shouldn't it?
How on earth had he done it?!
Chrollo's pupils trembled. He could not comprehend what had happened.
Moyu lowered his hand.
In fact, he had not used an exorcism ability to force the Evil Spirits to dissipate. His very existence had intimidated them into retreating of their own accord.
How had he done it?
Because he was someone who had died once.
"I can reduce them to nothing in an instant, and I can destroy that Nen Space called Exile Land just as quickly. Do you understand now, Chrollo...?"
Moyu certainly wasn't kind enough to let Chrollo die with peace of mind. He neither explained the reason nor explicitly mentioned anything related to Nen Exorcists.
Instead, he used what had happened to bring up the Nen Space Chrollo had prepared specifically