what abut a jet pack so you can jump higher and fall slower in azeroth
I wanna see some tunneling machine to go underground with
Submarines
Goblin engineers need to be able to make exploding chickens

The mats would be:
1 prairie chicken pet from westfall
1 stick of dynamite

and it would at your enemy and blow up

it would be a trinket with a long cooldown and an immortal chicken, and you could upgrade it with better dynamite