Grand Devil Pills

As the founder and perfecter of Devil Alchemy, Konrad's skills in that area stood leagues above that of any other practitioners. Moreover, unlike the rest, he could make use of his Truth and Life Embodiment as well as his Infiniteness Insight to magnify the results. Konrad raised his right hand, causing an eruption of black devil flames to soar from the cauldron. If before, Cacillia merely believed Konrad to be an eccentric deity, the eruption of eldritch energies convinced her otherwise. Something else, something more, something more she couldn't appraise. 

"What we cultivate is the Devil Road. In Devil cultivation innate talent is secondary. The foundation is the heart. Without an inflexible Dao Heart, don't even dream of becoming a Devil. At every level, your heart will face challenges. If you wave, at best you will stop breaking through. At worse, your Devil Heart will devour you and turn you into a Loose Devil Puppet.

Such cases are not unheard of."