The weapon perk Army of One will not activate upon killing a Goblin or Hobgoblin, both Vex and Taken varieties. I have already taken the time to test it with 3 separate weapons (Zarinea-D auto rifle, Queen's Choice sidearm, and Ruin Wake machine gun) and ran through every other enemy type and variations in the game in multiple locations to rule out weapon class/location/other units. The only enemy units not properly activating the perk are the two previously mentioned, regardless of weapon or locations. Platform is Xbox One. Video will be posted later. Edit: Video of PoE Vex rooms uploaded. Ignore the Burden of Proof shotgun, I just had because Minotaurs are a little much to take down with an off element sidearm. All of my other weapons displayed in the video were equipped with Army of One. Special effects because boredom.