Erinys

Several erinyes are found in the Cavern of Lament beneath the sunken ship off the eastern shore of Darkmoon Island. They drop the Ring of Promises, a quest-starting item that begins Broken Promises which rewards the Ring of Broken Promises, a toy for the Toy Box that functions as a felblood elf disguise.

They were created by Chester through some unknown process.

Trivia

 * Erinys is the singular form of, also known as the Furies, the chthonic deities of vengeance in.