Phantom Heart

"My heart hurts..."

- A demon suffering from the symptoms of Phantom Heart Phantom Heart (幻精神, Genseishin) is the name of an "illness" exclusive to the Demon race. Demons are powerful creatures when compared to humans, with the pinnacle of their survivability allows strong demons can survive losing their heart entirely. However, a phenomenon known as "Phantom Heart" begins acting up some timelater, appearing as various symptoms before reaching its climactic end, resulting in a "primal metamorphosis".

Trivia

 * The concept of Phantom Heart is somewhat inspired by Primal Reversion from Pokemon and Hollows from BLEACH.