The Spy (in-game name Vakoilija) is a flying robotic enemy found exclusively in the Power Plant.
Behaviour and Combat
The Spy is invisible by default. It shoots very fast blue bullets to deal moderate, unexpected damage. It is healed by electricity. Although difficult to see, it is not truly invisible when concealed, and can be seen before its attack. Its bolts have a short attack range, so they get close to the player before firing.
Move away from it. Its short attack range causes it difficulty in constantly attacking.