Wedding Ring of Death

The Wedding Rings are artifacts used by the Pillar Men.

They consist of hollow rings of an unknown material, containing a highly potent venom. Their apparently sole purpose is to ensure that anyone who promised to challenge the Pillar Men at a later time would have to do so, lest their lethal poison be released.

In Part II: Battle Tendency, Wamuu and Esidisi used these rings to prevent Joseph Joestar from escaping his fight with them 33 days after their first encounter.

About
These rings are designed to dissolve in a human body within one month.

The ability from the Pillar Men to pass through human bodies without damaging them allows them to place the rings on different organs. A doctor Joseph consults notes that his rings appear to be completely fused with the walls of the organs to which they are attached.

The only way to dispose of the rings and/or neutralize their poison is to retrieve and drink antidotes contained in specific piercings belonging still to the Pillar Men (in Wamuu, that in his lip, and in Esidisi, his nose). Because the poison is different in each ring, one cannot use the antidote from one Pillar Man's piercing on the poison from another's Wedding Ring.

Esidisi asks Kars if he wanted to place a wedding ring in Joseph, implying that he possesses one as well.

Trivia

 * The other Pillar Men suggest that it was common that Wamuu use this device on his challengers.
 * After planting his ring, Wamuu references the wedding vow, "Till death do us part".
 * Joseph challenges Wamuu to a fight after one month before it is revealed that the Weddings Rings are designed to dissolve in one month.