Chapter 27: Hidden Danger
Anir remained silent during Kaizer's shock, not telling him that there was, in fact, some form of backlash, though it did not stem from the psychic ability he had awakened.
The first question one should ask was: Why did Rina's subconscious suddenly decide to split itself to create Anir? Was it really just because Rina couldn't handle the power of death?
Obviously, deeper thought on the subject would lead one to conclude that this was nonsensical. Otherwise, why didn't Kaizer's own mind split to handle his psychic power?
Rina's death power definitely had a limit—just like every esper out there—and it had to do with its method of usage. Her power worked similarly to traditional pure magic casting in the sense that the death power she claimed from external kills did not strengthen her body, her mind, or her soul, but was simply fuel for her various abilities.
When Rina killed someone, the death power stripped away was absolutely not meant to be ingested or imbibed in any way.
However, when that part of her ability mixed with Kaizer's power, it naturally warped itself to suit his main ability, just as his did hers. So the death power that should be extracted upon murder for death-related abilities became psychic power that Kaizer stripped away from corpses, adding to his own psychic ability's baseline.
And because the targets were obviously dead, this psychic power was pure, not infused with their remnant thoughts, worries, or hatred that could cause him to go crazy or lose his mind later on. It really was pure, usable psychic power, just like Rina gained pure, usable death power.
So no, the typical "backlash" that Kaizer had been worried about didn't exist. Maybe there was a super-talented psychic out there today—or in history—who trained themselves to strip away psychic power from people, but such a person definitely could not do it after their targets' deaths since—as one just saw with Rina—the mindscape quickly evaporates after death.
If one stripped away psychic power while the person was alive, then yes, expect a big problem in the future when you accumulated too much. Only Rina's special death power with its unique authority to strip away death power upon a successful personal kill could allow for this.