Lion's demonoplasty came at a cost greater than he ever imagined. While the demonic hand gave him great powers, it was also gradually consuming his body and essence. The demonic appendage ate away at his own flesh day by day, turning him more and more into a demon. 
Tormented and enraged by endless chatter and goading of demons in his mind, Lion knows it is just a matter of time before he loses himself and completely becomes a demon of hell.