Tomb of the Boom 1 2 3

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. It has a small mouth with a long tongue, resembling that of a giant anteater. The top half of the Stand's head is open, revealing an eye-shaped object inside it. Its 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.

Abilities
Magnetism: The Boom Boom Family's Stand seems to have the power of magnetism. However, each member of the family uses his control over metal in a different way. The magnetism of the family is stronger when they are closer together, as well as when they are closer to their target.

Tomb of the Boom 1
Manga Debut: SBR Chapter 16, The Desert Born Outlaws (2)

Benjamin Boom Boom can let metal objects sink into his skin to replicate the appearance of another person, as well as increasing his defense. He can also spawn metal blades from his body after he lets metal objects sink into it. Lastly, he can make Metal Objects shrink by removing iron particles from them.

Tomb of the Boom 2
Manga Debut: SBR Chapter 15, The Desert Born Outlaws (1)

Andre Boom Boom is the most powerful of the three, according to Benjamin. His ability allows him to turn any living being into a magnet by letting them touch any part of him, this includes a few drops of blood. He can magnetize several people at once; they, and the metal objects near them, are attracted to each other. This magnetism is so powerful that the victims' bodies will rip themselves apart.

Tomb of the Boom 3
Manga Debut: SBR Chapter 19, The Devil's Palm (2)

L. A. Boom Boom is the most combat-oriented out of the three of them, and has the ability to manipulate Iron Sand, so he can immobilize his targets. He is able to attract small metal objects as well. 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.