Iocace

From Introduction:

Four arms she has, and a head covered in flames. Where legs should be, there is instead a great, long snake’s tail, covered in copper scales. From her back sprout six mighty wings, covered in ivory, indigo, and cerulean feathers of exquisite fineness. For each of her hands she has a sword, curved and sharp, as cold as ice. This is Iocace, arch-fiend of the abyss. She can be summoned to the material plane by unscrupulous sorcerers, but she is accompanied by misery and ire at all times.