Nalghban the Foul, Dark Moon Clan Elder Shaman, is a Super Unique Khazra Shaman in Act I of Diablo III.
He appears during the Trailing the Coven quest, jumping out of the ground together with four Khazra after the player loots the Sacred Khazra Staff from Karyna's Lost Wagon. Killing him is not required for the quest.
In combat, he has Electrified and Illusionist affix, and shoots Lightning bolts instead of regular Cold spheres.