Anti Droid/Engineered Anti Droid

About
The Engineered Anti Droid is a passive droid that is removed from the game. It looks like Anti-Droid but yellow. Originally, it was literally built like a glass cannon, having only 1 health but having the ability to insta-kill nearly any droid to pay off, making it able to easily decimate enemies at the expense of dying easily.

It could only be spawned from the Engineer, but this was later changed to where it can no longer be spawned due to it's removal.

Trivia
It could also have been spawned by the wrench item. But the wrench was removed from the game, later it was re-added with a brand new function: halving droid's HP; just like the Engineer class itself.