Wunder Weapon name: The Freezer(The FR33Z1FI3R 3000)
Ammo: 15 Cans of freeze/10 second of freeze in each can/can be shot in short bursts for ammo conservation
Damage:Freezes zombies in place and takes 1/4 of their health away, so that you can finish them off with the.....
The Hellfire(The Gun That God Made)
Ammo: 10 cans of gasoline/10 seconds of fire each
Damage:50 damage every second shot/can kill multiple zombies
Their should also be a Easter Egg where you can acquire a upgraded Wunderwaffe that shoots 20 flechetes and each flechete does 75 damage each
I know I'll probably get a lot of hate on this but it is a pretty good base concept.