Kingdom of Stolen Crowns by Stephanie Storm (Author)

Condemned and stripped of power, vampire lord Victor Custodis is exiled to a villainous realm that’s eager to devour him. His quest for a portal home implodes when he’s captured by Runa Starborn—an enchanting sorceress, and leader of a blundering gang of bandits.
She seeks revolution. He craves vengeance. Except fate lands them in the Fallen Trials—a crowd-pleasing bloodbath where betrayal wins and trust is a gamble.
Between monsters, mayhem, and sparks of attraction, surviving each other might be their biggest challenge. As buried magic awakens, Runa must decide if the blackguard she kidnapped is her ruin… or the kingdom’s savior.
Because Carcerem is dying. The False King’s lies are shattering. And the prophesied heir to a stolen crown just fell into the hands of a thief who refuses to kneel.