Every fortune seized comes at the price of another's ruin. Born to legendary assassins, Jack Grim was forged in cruelty—a weapon honed for one purpose: dealing death. On his seventeenth birthday, Jack faced his final assignment as an assassin's apprentice. "Complete this contract, and your own criminal empire awaits. The life you've dreamed of becomes reality." It was the culmination of everything he'd trained for—the moment to claim his destiny as a master assassin. Jack eliminated his target before dawn, claimed his victory, and inherited the empire he'd coveted. Then came the price: splitting pain, burning sickness— and instantaneous transmigration. Jack's consciousness awakened in Raiden's form—the guardian of the Book of Ashes, a tome of immense power, the very artifact the fallen Raiden had sacrificed himself to shield. Jack craved nothing but his old existence as a hired killer. Returning to his assassin's trade was all that mattered. Yet fate imposed its own demands. The world's survival depended on keeping the book safe—and whether he accepted it or not, Jack now bore that burden.