The Armored Stalker is a upgraded version of the regular Stalker, It is Black, It has sharp teeth, has a Dark Eye in its Bloody Mouth, It also has six spider like legs, it also has more health than a regular Stalker, It was the 5th Boss in Pixel Gun 3d: Pixelated World, Bridge, It was sadly later removed in a future update, and it got replaced by some stupid fat zombie.
It is faster than a Hostile Wolf.
Don't worry, It will come back in the future as a mob in a future, Fanon Minecraft game wiki.