Alzrius is the Lord of the Flowing Flame, and rules layer 601 of the+Abyss, Conflagratum.
His physical form is actually a large pillar of flame, and when his
armies go on a campaign, the leader of the armies carries a piece of
Alzrius's body as a torch.
He had a magic item, the flame amulet of Alzrius, in Polyhedron
#135 (written by Erik Mona). Also, while not explicitly stated to be
his, one of the armors from the article "Armor of the Abyssal Lords" (Dragon #270) is likely his, as it has a flame theme, and the article says no one knows which lord that armor is attributed to.
Sources: Hellbound: The Blood War, Fiendish Codex I: Hordes of the Abyss
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