[Overpowered protagonist] + [Taleweaver] + [No heroine] + [Scheming]
Xu Hao was bullied at school and driven to jump from a building. After being reborn, he unexpectedly gains a terrifying magic box that can create supernatural entities and urban legends.
From then on, Xu Hao turns to the dark side and begins his revenge.
He makes the people who bullied him experience the thrill of jumping from a building themselves, then traps their souls and turns them into supernatural materials, using them to create a three-headed hellhound that will serve him as a dog forever.
As Xu Hao searches for supernatural materials to create urban legends, he discovers that countless entities and monsters lurk beneath the gleaming surface of the city.
Man-eating entities and monsters, the Shamanic Cult that worships demon gods...
“But they're all just raw materials for the toys I make: my urban legends...”
It's not bad. It's a novel setting. There's obviously no heroine, but there's a lot of ambiguity.