Still Lives (Ch.167)

"What does this mean?" Terin asked, neither the Fanged nor the hunters could determine where Kira was headed with her revelations.

And the solemn expression on her face could not be deciphered, the commander of the Fanged elite only ever had this one expression when executing her duties.

"A demon's magic core is linked to their soul, it is impossible to extract one from the other." Kira continued.

"Which means the absence of a magic core would imply that the demon king's soul was extracted from his body at that moment of death." 

"Following this discovery, I have made intensive research on the possibility of this and there are indeed many ways known to demon kind to harvest the soul."

"As long as one posseses sufficient magic, it is even possible to defy death and transfer one's soul into the body of another or to a temporary medium, while the transfer to a body can be done at a later time." Kira explained.