DIO's Bone

The term DIO's Boner (DIOの骨 DIO no Hone) refers to a bone belonging to DIO, entrusted to Enrico Pucci before the events of Stone Ocean.

Summary
After Pucci enlists Sports Maxx's power to bring it back to life, the bone becomes infectious. Anyone who touched it would mutate, slowly germinating until becoming a sort of plant.

Once turned into plants, the nutrients they absorb from sunlight were given to a baby-like creature referred to as DIO's homunculus, or the Green Baby. Upon the birth of the Green Baby, a part of DIO's soul was reborn into it.

This part of DIO then sought out Pucci, and, upon finding him, fused with his Stand in order to create C-Moon; as a fusion of DIO's Stand The World and Pucci's Whitesnake.

This Stand seems largely to have been a placeholder for a final step, as DIO slowly assumed Pucci's mind and they became one. C-Moon's gravity manipulation allowed Pucci to perform the final step in the evolution, giving him Made in Heaven: a Stand able to accelerate time.

In this final form, Pucci demonstrates several of DIO's tactics, such as using his control over time to launch an attack of speeding knives at the heroes.