Ahriman
Shown by first publication year; this may not be reading order.
All is Dust
Ahriman: Exile
Ahriman: Hand of Dust
Ahriman: The First Prince
Ahriman: The Dead Oracle
Ahriman: Gates of Ruin
Hounds of Wrath
Ahriman: Exodus
Ahriman: Sorcerer
Ahriman: Unchanged
Ahriman: Key of Infinity
Ahriman: The Omnibus
King of Ashes
A Coin for the Carrion Thieves
Ahriman: Eternal
Ahriman: Undying