Mad Blood (狂血 Kyōketsu in Japanese) is one of Crona's newest and arguably most powerful attacks which is achieved through their enhanced Black Blood after performing Madness Fusion with the Black Clown. Mad Blood, however, can grow powerful enough to engulf an entire city, flooding it like a tidal wave, melting all of its people and buildings and hardening into a gigantic black sphere. It is currently unknown as to whether this ability is simply derived from the Black Blood in question or instead, an actual evolution of it.