[@AdobeFlash] Essentially, the user would be a vampire who could use the Ripple prior to their vampirisation, only they can't use it normally now because it'd kill them; there's precedent for a situation like this in canon, of course, so that's presumably fair. However, they then get themselves a Stand, whose main effect is essentially to "invert" the relationship of the user's Ripple energy from life to death. As a result, where a normal Ripple would have various effects on a living being whilst melting vampires and Pillar Men into sludge, this "Black Ripple" (or Dark Ripple, or Dead Ripple, or whatever name is appropriate) now synergises with many vampiric abilities and helps deal with sunlight and regular Ripple attacks from still-living Ripple users, both blocking and healing damage from those and other sources, whereas a living being who gets struck by it will rapidly necrotise and decay to the point of death, and may be resurrected as a zombie if the user desires it, or even another vampire if their willpower is strong enough.