Observation drones appear in the bonus map Deception. They are represented by the science vessel, though do not use any abilities apart from detection.
Should a drone be attacked, it will automatically retreat from the source of fire. After a while, it will return to its pre-established patrol route.
The Defensive Matrix absorbs 250 points of damage from all damage type. The shield is not perfect; some damage will "leak" and reduce the unit's HP by 0.5 per hit.
Matrixes count as having priority over shields, so health will appear to go down first on Protoss units.
Successive casts on the same unit do not stack, but replace any old Matrix with the new one.
Usage
Hotkey
D
Cost
100
Range
10
Duration
56.7 seconds
EMP Shockwave
Reduces shield and energy to 0 for all enemy or allied units within the blast radius. Particularly useful against protoss units and buildings.
Reduces the hit points of biological units near the targeted unit (and the targeted unit itself if it is biological) by 250 over 25 seconds. (Deals 3.33 damage in 8-frames intervals, resulting in 75 damage instances over 600 frames.)
Mechanical units are immune, but biological units within 2 hex radius of an irradiated mechanical unit will still be affected.
Damage from multiple instances of Irradiate fully stack.
