Possessed

Although it's more likely that you'll face Possessed as enemy units in the various missions in which you have to battle against the occult forces of the Dominion, there are a few ways in which they can find their way into your army as well. If they can close to melee range, they can destroy enemy formations quite quickly, which makes them very dangerous to low-level players. However, units with good accuracy should be able to pick them off before they can do too much damage.