Cover of Slag

Slag

Fantasy · 432 pages · Published 2024-09-10 · Avg 3.5★ (6 reviews)

The searing first novel in the Shadowclad Saga, about love, curses, and the price of forging a fate from ruin. For as long as she can remember, Yara Mirov has believed the Forge-Fathers shaped a match for every heart, until she learns that the boy she loves will pledge his life to another beneath the smoke-bright pennants of Varkas. Desperate to stall the binding and to heal what she shattered, Yara barters with the veiled and wicked Cinder Prince, patron of the Cathedral Forge. In exchange for his help, he demands three iron vows, to be spoken at the time and place of his choosing. But after Yara gives the first vow with a hammer strike that changes the course of the city, she discovers that bargaining with an immortal is a perilous craft, and that the Cinder Prince wants far more than he first claimed. He has plans for Yara that wind through gearlit catacombs, living furnaces, and a river of molten glass, a design that will end either in her brightest tempering or the most exquisite ruin.

Continue the saga in Ember's Reckoning, The Bellows of Winter, and The Anvil Remembers. Also by John Petrov: The Ironbound Duology - Winter Anvil - Wolf at the Crucible; The Ashen Map; The Gloamwright.

Photo of John Petrov

John Petrov is a Ukrainian American fantasy author and former metallurgist whose work welds folklore to smoke and steel. Raised between Cleveland and Kyiv, he studied materials science before apprenticing in a small forge that supplied theater armor, an experience that informs his industrial magic worlds.

He is the author of the Ironbound Duology (Winter Anvil, 2019; Wolf at the Crucible, 2021), the standalone novel The Ashen Map (2022), and the story collection The Gloamwright (2020). His fiction has received the Brass Lantern Award and was shortlisted for the North Coast Book Prize. John Petrov lives in Portland, Oregon, where he teaches community workshops on mythic worldbuilding and knife-making.

Ratings & Reviews

Hannah Voss
2026-03-30

As a selector, I'd offer Slag to adults and older teens who like forgecraft fantasy, loaded bargains, and morally thorny leads, though I'd note that the industrial lexicon is dense and the angst runs hot. Readers seeking whimsy or clear-cut comfort may stall.

Content notes include coerced oaths, manipulation by an immortal patron, class and faith conflict, workplace peril, brief but intense violence, and obsessive attachment. The craft focus is distinctive, yet I found the momentum uneven and the romance strain heavy, so my purchase priority is low.

Ibrahim Noor
2026-01-12

Slag obsesses over making and remaking, over whether the self is poured into a mold or hammered into shape, and it keeps asking if there is "a match forged for every heart" or only the heat we choose. Love sits beside debt here, as religion and desire trade sparks, and the ending arrives as a lesson about cost that feels bracing if a little neat. I admired the argument more than I loved the journey.

Quinn Patel
2025-08-07

The city of Varkas feels engineered and enchanted at once, its guild prayers braided with soot, its pennants bright over streets thrumming with forgehammers. Gearlit catacombs, living furnaces, a river of molten glass. Each locale has rules that make sense and consequences that bite.

I adored how the magic is not spellcraft but craft itself. Every bargain is a heat exchange, every vow a quench that tempers or shatters. The stakes grow from that physics, so when Yara swings the hammer, the city rings.

Selene Duarte
2025-02-19

Yara reads as stubborn, wounded, and hungry for a world that will name her, and the text lets her make ugly choices without varnish. The Cinder Prince is all gleam and shadow in dialogue, needling every weakness while pretending to tend the fire. Their exchanges hum with unequal power, which makes the small honest moments feel earned. I believed the romance that isn't quite romance, and I winced when the first vow lands like a spark in dry straw.

Devon Alvar
2024-10-03

Petrov's sentences spark with metallic texture and careful repetition, and the book leans into motif as structure: vows hammered at pivotal beats give the arc a ring of inevitability. A few sequences linger too long in smoke and sweat, slowing momentum, yet the set pieces in the Cathedral Forge land with clarity. The intimate perspective keeps the city tight around Yara, though scene transitions can feel abrupt. A strong debut voice that could breathe more between swings.

Mara Y. Koh
2024-09-15

Slag moves like a bellows pulling heat, with Yara's desperate bargains flaring and falling as the Cinder Prince names his price.

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