Peleil, Warden of the Firestorm, is a Unique Maiden of Flame, and the final encounter during the Firestorm event in Plague Tunnels Level 2 in Act V of Diablo III.
She is Molten, and may summon 5 Revenant Archers at a time, which no other Maiden of Flame can do, in a pillar of fire that stays for 6 seconds (and causes Fire damage if players stand in those). To make it worse, players will have to face her with the four Furnace Vents fully empowered, sweeping every corner of the arena with streams of flame every few seconds. Killing Peleil and her summoned Reapers will end the event.