The Cellular Mutation of the Demon Slayer Mark (DS Canon)

You watch the Hashira unlock the Demon Slayer Mark and assume it is a mystical power-up. But the canonical reality of Demon Slayer proves it is a suicidal physiological condition. Here is the biological horror of how the Mark forces your cardiovascular system into a violent, hyper-metabolic overdrive that fundamentally destroys your body from the inside out. #demonslayer #kimetsunoyaiba #demonslayermark #anime #animelore