Hollow Reign
Summoned to another world alongside his classmates, Hiyori Yamamoto receives the weakest profession imaginable: Synergist.
Cast aside by those meant to protect him, Hiyori plunges into the Hollow Maw, a labyrinth where no human is meant to survive.
Instead of dying, he adapts.
Through relentless experimentation, he transforms alchemy into engineering, forging firearms, explosives, drones, and weapons centuries ahead of their time. Every battle tempers him into something no kingdom, demon, or god could have anticipated.
Alongside powerful allies—including the feared former Demon Queen, Nia—Hiyori climbs from the abyss, uncovering the forgotten legacy of the Liberators and the truth behind the world’s false gods.
The weakest Synergist has vanished.
In his place stands the Hollow King.