Miserere: An Autumn Tale

Miserere: An Autumn Tale is a dark fantasy novel by Teresa Frohock. In the Woerld, they keep endless guard to prevent Hell from escaping to attack Earth. But Catarina has instead made a deal with a devil and is going to unleash them. Her captive brother Lucian takes a chance to escape, and has to rescue a foundling -- a character brought from Earth -- by magic he is forbidden to use, which sets the opposing forces against him as well.

Tropes used in Miserere: An Autumn Tale include:

All Myths Are True: Any religion can hold off the demons.
Bearer of Bad News: Raechel tells Lucian, and has him tell Lindsey.
Blood Magic: Names written in blood are especially powerful.
Cain and Abel: Lucian and Catarina.
Charm Person: Catarina gains a voice that causes this.
Children Are Innocent: One character warns against trusting this trope.
Cold-Blooded Torture: Catarina inflicts it.
Cool Sword: Don't steal their swords. It doesn't work for you.
Damsel in Distress
Deal with the Devil: Catarina has struck one
Dude in Distress: Lucian
Dreaming of Things to Come: Most people in Woerld can't dream. If you dream, it is prophetic.
Due to the Dead: Rachael does it for Lucian's sake, not the dead woman's.
Evil Is Deathly Cold: Catarina's amulet
Evil Uncle: Lucian and Catarina's back story
Familiar: Cerebus.
A Friend in Need: Lucian to Lindsey
Glad To Be Alive Kiss: They remember their past in time for it to stop.
Go On Without Me
Green-Eyed Monster: Catarina
The Hedge of Thorns: The Rosa's purpose.
Herald: A priest sends Lucian on his escape.
Human Sacrifice: Catarina's plan.
I Know Your True Name: Part of the magic
It's All About Me: Catarina
It Was a Gift
Light'Em Up: The light spell
Light Is Good: Only good guys can cast the light spell.
Like a Son to Me: What John had said to Lucian when he was convicted.
Love Triangle: A sister and lover toward Lucian -- because Catarina insisted on it.
Magic Feather: Lucian explains that Lindsey is the source of the power, not the Psalter, which he merely gave her to help her focus.
Mordor: The Barren
Naive Newcomer: Lindsey
Our Ghosts Are Different
Parental Substitute: Lindsey explicitly contrasts Lucian's pride in her with her own father.
Peaceful in Death: Rachael thinks on the aversion.
Power of Love: Matthew's ghost tells Lucian that God's power, based on love, is stronger.
The Promise: Lucian's, to his sister.
Protective Charm: Lucian tells Lindsey that the Psalter is this.
Protectorate: Catarina to Lucian. This is a problem.
Rule of Three: Lucian denies Catarina three times.
Scars Are Forever: Lucian's limp
So Proud of You: Lindsey picks this up when he tells her she's Katharos.
Tears of Blood: Katharos shed them on contact with the Fallen
Tears of Fear: Lindsey asks if you're whiney to shed them.
Tears of Joy: At one point, Lucian think he could shed them.
Thicker Than Water: An argument Catarina uses on Lucian
Title Drop
Trapped in Another World: Everyone who comes through the Veil.
Unable to Cry: It takes Lucian some time after he kills Catarina.
The Unfavourite: Lindsey
When Trees Attack: The Rosa moves.
You Can't Go Home Again: Characters are brought into the Woerld, but never out.