"Is there any way to use it without the toxic effects?" Kayden tried to manipulate the mana slightly, but within seconds, he felt the source of its toxicity—it directly affected his soul, contaminating small fragments of it with mana.
This contamination was like a residue of ink. The soul remained mostly the same, but small portions of it became intoxicated. A tiny fragment could recover after a few years, but survival became increasingly difficult as more fragments were affected.
Kayden ran several tests and found no way to cleanse his soul. He couldn't even make it recognize the contamination—it was as if the ink didn't exist for his soul. This rendered him unable to cleanse it since it's impossible to clean something that isn't perceived as dirty.