Weapon design

At some point in school we had to design a total of 4 weapons, each one with a specific requirement:
-One had to be a weapon designed completely by us (The Void Scythe)
-One had to be a wearable weapon (The Doom-Fist)
-One had to be a weapon against a specific type of enemy (The Demonbane)
-One had to be a wonky, funny weapon (The C-T 00 Cannon, where C stands for Cat and T stands for Toast, Lookup Cat-Toast engine if you don't know what I'm talking about)