Brain Storm

Brain Storm is not one being but a colony of small, spiky, block-shaped organisms that resemble interlocking burr puzzles. Each carries barbed feelers able to stretch out and pierce skin. In colored pages the swarm appears in shades of violet and dark purple. Its makeup as a tiny colony wielded by a doctor evokes germ-based bioweapons, while its melting effect and the hemolysis it induces call to mind flesh-eating infections and malaria.

Urban Guerrilla casts the colony from his hands, and any flesh it lands on begins to rot. The creatures first hook their feelers into the surface of the skin, then punch through and drive those feelers deep inside. Once within, the Stand triggers hemolysis, pushing ever further into the body while multiplying at a runaway pace, so the victim seems to have holes bored straight through them.

As Rai Mamezuku notes, there is no pulling the colony out once it has breached the body; the only recourse is immediate amputation of the affected part to avoid death. Before it enters, though, the threat is trivial, and a simple rinse of water washes the creatures away.

Urban Guerrilla, a Rock Human who operates as a doctor, is the only user of Brain Storm. He turns it against several opponents in JoJolion, among them Yasuho Hirose and Rai Mamezuku.