C453 Magic Gun and Time Blade.

"You came at the right time, brat. You said that you would make a Magic Cannon, but you can't make more than ten or eight of them. It made us so afraid to disassemble it, and we can only guard it every day. We can't even move it," Dr. Bai complained.

"That's right. Even if you make three of them, we can split them evenly. It will save us the trouble of fighting over it every day," Dr. Yuen said