Eye of fear and flame

An eye of fear and flame was a very rare type of undead, that were believed to be created by chaotic evil deities. This was said to be for the purpose of spreading darkness, destruction, and foment the downfall of lawful creatures. Though some claimed that they were also created by lawful gods to test their followers.

Description
These undead were human-sized figures with skeletal forms with a gem in each eye socket, one red and one black. They were always dressed in a ragged, hooded cloak. The interior of their hoods were seen as nothing but an opaque black void, which helped to obscure their face. Whenever they were attacked, or their commands were not being met, an eye of fear and flame would throw back their hood and reveal their grisly visage.

Abilities
Some claimed that these undead innately knew the alignment of any creature around them. But in reality an eye of fear and flame simply possessed an innate spellcasting ability that allowed them to cast detect good, detect law, detect evil and good, and detect thoughts. In addition, they could cast the spells etherealness and true seeing once per day, as well as ethereal jaunt twice per day.

Spells that affected vision, such as blindness and power word, blind, would be reflected by their gems back at casters.

Uniquely for an undead creature, an eye of fear and flame was immune to the effects of turn undead.

Combat
Whenever combat was not going in their favor, an eye of fear and flame would attempt to flee, often by taking on an ethereal form.

Rumors & Legends
Some rumors claimed that there were around only twenty of these undead in existence.

Trivia
The drow adventurer Jarlaxle had an enchanted eyepatch that exhibited powers similar to an eye of fear and flame.