The Revenge Death Ball is the signature attack of the Tuffle parasite, Baby. The sphere is comprised of the pure negative, dark-blue energy of all the possessed people under Baby's control, making it an evil Spirit Bomb, of some sort. Unlike the Spirit Bomb, however, the energy is evidently stored within Baby, and can be replicated (and possibly amplified) at any time after the initial energy is absorbed. It is strong enough to shake the very fabric of dimensions, as seen when its aftershock made Kibito Kai accidentally drop Goku while in the teleportation dimension. Baby later used the attack against Goku after Goku had become a Super Saiyan 4, which, like the rest of Baby's attacks, proved useless. Also, the Revenge Death Ball appears to be highly volatile as it will explode upon contact with anything, even the ground (making it unable to penetrate the surface of the Earth, such as Frieza's Death Ball). Although it is Baby's strongest attack, because it cannot penetrate the Earth, it is incapable of global destruction, unlike the Super Galick Gun.
Baby has developed two variations of the Revenge Death Ball, both of which are used in his Golden Great Ape form.