Osiris

Only Osiris' upper body is ever shown, its possible lower half swallowed by mist. What is visible reads as a broad-shouldered humanoid: a heavy brow, arms that bulge with muscle and are traced by vein-like patterning, and suckers where its fingertips should be. Named after the Egyptian deity of prosperity and the afterlife, it shows no will of its own and obeys D'Arby's orders without a thought. Its coloring shifts by medium, since the colored manga gives it a purple body with yellow eyes, the anime makes it green with red eyes, and the OVA a paler green. JOJOVELLER frames the design as an African traditional image rearranged and fitted with mechanical parts.

Osiris works on its own, and the danger lies in how cleanly it dovetails with its master's gambling. It claims the soul of any player who loses a wager or match to D'Arby, but only the moment that loser gives up inside, a private surrender that drains their spiritual energy nearly to nothing. Each stolen soul is pressed flat between the Stand's palms and kept as a poker chip, which the gambler treats as a personal hoard. For the theft to fire, the opponent must first agree to stake a soul, and if someone bets a soul that is not their own, Osiris still collects it, reaching an absent party who never consented.

D'Arby tolerates cheating as long as nobody catches it, and he can wager entire souls or split one chip into several blanks that together equal a single soul. Should he ever own up to his own defeat, every soul he has won spills free, and he may release any of them whenever he likes; by his own account, his death would snuff out all the souls he holds. He also seems able to memorize whatever he handles, be it a page number or a playing card, a knack he exploits to read an opponent's hand, though whether it stems from Osiris or from his talent as a dealer is left open.

D'Arby the elder, a masterful gambler, is the sole wielder of Osiris. With it he gathered the souls of much of the Joestar party, Joseph Joestar and Polnareff included, and nearly wiped out the entire group before Jotaro Kujo out-bluffed him at the table and forced every soul free.