Religion in the Black Peaks
The people of the Black Peaks are dualists, believing in two deities: the Great Builder and the Trickster. I confess that I am stealing the look and feel of the video game Thief: the Dark Project.
The Great Builder
The Builder is associated with Law, Order, Stability, and Industriousness. He is known by many names: the Anvil of the Universe, the Architect, Dominus, the Forge-God, Leviathan, the Master, etc. The Builder is generally worshiped by Dwarves and Lord Stefan's men, who have conquered much of the surrounding territory and imposed their beliefs on the locals, establishing the One Lawful Church of the Great Builder.
The Trickster
The Trickster is associated with Chaos, Anarchy, Liberty, and Shrewdness. She is known by many names: Croatoan, the Liar, the Mother Who Devours Her Young, the Queen of Midnight, the Savior. The Trickster is generally worshiped by Elves and Goblins, though certain Men who were living in the region long before Lord Stefan arrived pay homage to this deity too. Cardinal Ludwig has done his utmost to exterminate the Trickster faith in the Black Peaks, branding it the Blasphemous Cult of Chaos. Few Trickster cultists dare to practice their faith openly.
Religion in the Principalities of Glantri
The peoples of Glantri have an interesting relationship to religion. While most forms of religion may be practiced freely, the Princes have banned the use of priestly magics within Glantri's borders. In the absence of the obvious miracles such magics provide, religion is more a matter of faith than it might be elsewhere in the world.
Many gods are worshiped in Glantri. Foremost among them is the Great Builder, whose worship is so common in the southern kingdoms. But the cosmopolitan streets of Glantri City are home to shrines of many other gods of Law. The Church of the Great Builder portrays the other gods as lesser entities — "saints", if you will — in His service; the priests of those gods often dispute such claims, claiming a coequal status within a broader pantheon.
A few shrines to the gods of Chaos can also be found in Glantri. Wizards have always sought power from Chaos, and wizardry is Glantri's national pastime. Moreover, in the wake of the civil war, Glantri's people have more cause than ever to appease the Chaos powers. And as the darker Chaos cults are illegal to begin with, their clerics have no cause to stint on their use of unholy magic, making it all the easier for them to win converts.
Some of the more noteworthy deities propitiated in Glantri are indicated below:
Trianoma
Called "the Thrice-Named", Trianoma is the goddess of law, societal mores and magic. She is generally worshiped by upper-class citizens, particularly magic-users. Many of the Princes provide special dispensation to their household priests allowing them to call upon Trianoma for priestly miracles.
The Old Ones
Even masters of the black arts shudder to speak of the Old Ones. Believed to predate even the forces of Chaos, the Old Ones — also called the Elder Things, the Outer Gods or the Other Gods — are eldritch beings of nameless dread, lurking beyond the veil of eternity until the stars are right to return. It is whispered that the family d'Ambreville made pacts with these terrible entities long ago.