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Desires – these were the only drawbacks that the Demonic Practitioners were facing. It was also their weakness in a sense since suppressing these desires required much stronger willpower and perseverance.
Desire for destruction, desire to become stronger, desire to consume others, desire for revenge, and many others. These were the desires that usually the demonic practitioners faced whenever they were training their respective methods. They were commonly called the inner demons for some people, who were trying to consume an individual.
Once consumed, the said individual would turn into a mindless monster that knew nothing but to follow its desire, their instincts. But if they managed to overcome these inner demons, then they would become enlightened and reach a height that never seen before.