Raziel

Raziel, The Dark One is a unique Wraith that can be found in the Sewers of Caldeum in Diablo III. He spawns for an unmarked event, as you open the Ancient Chest by Chiman's request.

In combat, he has Electrified affix.

Trivia

 * Raziel is the Archangel of mysteries, Keeper of Secrets, in Judaism.