My name is Fang Sanhen. I'm ruthless in three ways: ruthless to others, ruthless at heart, and ruthless to myself. I've transmigrated twice: once into the body of my real-life boss, and the other time, my transmigration was delayed by 200 years. I spent those 200 years training hard, growing strong and powerful, and obtaining a Demon Castle System. I even became the Thirteenth Demon King, able to keep strengthening my subordinates.
Goblin: "Boss, we were only trying to scare them. There's no need to really do this, is there?"
Fang Sanhen pinned the goblin's head beneath his shoulder as if he might crush it at any moment.
"Everyone, attack together! The Demon King can't kill all of us!"
Fang Sanhen: "Want to ask my Vulcan cannon if it'll agree to that?"
The books you write must have five stars (ノ^o^)ノ