Every startling and unconventional secret skill comes with its own price and drawbacks.
Although the use of Demon Cores to enhance the power of a Martial Artist is indeed a shortcut, producing remarkable results, the drawbacks are equally considerable.
First and foremost, no matter how pure a Demon Core is refined, it is still a Demon Core, containing a trace of the most essential Demon Qi.
This most essential Demon Qi, while almost non-existent, cannot be completely refined. If a Martial Artist absorbs too many Demon Cores over the years, a burst of Demon Qi will eventually occur.
Secondly, the strength gained from Demon Cores is, after all, achieved through a shortcut, which can easily lead to unstable foundation.
This issue can be solved by using various Pills to reinforce the foundation.
But, as the absorption of more Demon Cores, not only will there be a gradual accumulation of Demon Qi in the body of a Martial Artist, but their minds will also be affected by the Demon Qi.