"Love, happiness, kindness, compassion, and even the ability to feel sympathy for others slowly begin disappearing. The more corrupted Mana the practitioner absorbs, the harder it becomes to experience those emotions. Eventually, all that remains is hatred, resentment, anger, and the desire to destroy everything."
Eventually, the user becomes a mindless monster who wants to destroy everything. When that happens, the Heavens react and send down Heavenly Tribulation to destroy this taboo of all taboos.
Serena felt her heart sink upon hearing those words. She finally understood why Ren had become so different from the man she had known for so many years.
It was not simply because he was angry about losing the war or because Leo had abandoned him. The forbidden technique itself was changing him from the inside, slowly destroying the emotions that had once made him the person she loved.
"Ren, please..." Serena whispered while looking at him with pleading eyes.
