The Fiend's Embrace
From Oberon_wiki
The Fiend's Embrace is a legendary item; a cloak created by the Demon Prince, Graz'zt for his (then) lover, Iggwilv.
The cloak is said to be made from the skin of a Pit Fiend who Graz'zt personally slew in battle. Although Iggwilv is believed to have been wearing it when she met her eventual demise, there are rumours that she actually had sent it to one of her trusted advisers before her death and that it still resides on Oberon.