Scarnax

Scarnax, Guardian of the Tomb is a unique Scarab that can be found during the event The Stinger Pit in Ruins of Corvus in Diablo III. It has Plagued and Molten affixes. While not a challenging foe by itself, Scarnax is assisted by endless hordes of lesser Scarabs, which can be quite annoying, especially since they block path and prevent you from moving away from Scarnax's molten streams.