Tomb of the Boom

Tomb of the Boom (トゥーム・オブ・ザ・ブーム) is the shared Stand of the Boom Boom Family featured in Steel Ball Run.

Appearance
Tomb of the Boom is a fairly small Stand with a vaguely humanoid upper body. Each version of the Stand bears a largely different appearance from each other; In all three versions, it possesses an elongated face with a long tongue coming out of a small mouth, resembling that of a giant anteater.

On Tomb of the Boom 2 and 3, the top half of the Stand's head is open, revealing an eye-shaped object inside it. Tomb of the Boom 1 instead has hood-like metallic bars over its head.

The shape of the lips of each Tomb of the Boom also differ: TotB 1 has thick, puckered lips; Tomb of the Boom 2 is the most anteater-like, with a perpetual smile on its face; TotB 3 has circular, multi-layered lips.

All versions of Tomb of the Boom possess long, sharp fingers, with TotB 3 having four on each hand rather than five. Tomb of the Boom 2's hands are striped.

Tomb of the Boom 2's lower body is a mass of human legs, with some disproportionately small, arranged in such a way that they resemble the legs of a crab; the amalgamation of many body parts may allude to the fact that it has several users, though the full bodies of the other two are never shown.

Magnetism
The Boom Boom Family's Tomb of the Boom seems to have the power of magnetism. They have control over metal, and can notably destroy one of Gyro's Steel Balls before it can reach them.

Each member of the family, Andre like Benjamin and L.A., turn people into magnets by touching them, including a few drops of blood.

Once turned, every metal objects near the victims will be attracted to them and sink into their body, causing crippling wounds. André can magnetize several people at once and the victims will also attract each other. If the affected people get far enough from the Boom Boom Family, the magnetism weakens but if they sufficiently approach a victim, the magnetism is so powerful that the victims' bodies will rip themselves apart. Moreover, while two people near each other midly attract each other, the magnetism also becomes lethal if three people are near each other.

Each member of the Boom Boom Family

Tomb of the Boom 1
Benjamin Boom Boom can let metal objects sink into his skin to replicate the appearance of another person or spawn metal blades from his body to attack by surprise.

His Stand is strong enough to deflect bullets from a revolver.

Tomb of the Boom 2
Andre Boom Boom is the most powerful of the three, according to Benjamin. However, it isn't seen doing anything particular.

Tomb of the Boom 3
L. A. Boom Boom manipulates iron sand. With the sand, L.A. immobilizes his victims by binding their limbs. Lastly, he is able to kill a person by manipulating the iron particles in their blood to suck out their blood.

Trivia

 * The Stand's name was revealed in the JOJOVELLER artbook.