Aqua Necklace

Aqua Necklace (アクア・ネックレス) is a stand ability featured in Part IV: Diamond is Unbreakable.

About
It may disguise itself as any kind of liquid, but favors edible ones. As such, it is capable of possessing people from the inside and causing serious injury, usually in the head.

Aqua Necklace was also responsible for the death of Josuke's grandfather Ryohei Higashikata.