Enya the Hag controls Justice, a terrifying stand that is made of a cloud of fog. It can control anybody by tying strings of fog into their open wounds. Since it is a fog, it is also basically impervious to physical attacks. Justice was ultimately defeated when Jotaro uses Star Platinum’s agility and power to disperse Justice before it can reform itself.

Correction

Um actually … Jotaro did not disperse Justice. He used Star Platinum to inhale Justice, causing Enya to suffocate.