Erinyes

An Erinyes is a type of powerful devil that sits high in their hierarchy. The Sable Warden Meriele Berevan told Mira that they are often bodyguards, agents and emissaries for devils that rule the Nine Hells, and some rise the ranks to serve Teli Monei himself.

Vastren is an Erinyes, and gave information about Erinyes to Etorn Hadaran when he asked her about them. The Sable Warden had not heard of Vastren in particular.