The Terror Drop is a Russian support power available from the Palace, which, as its name suggests, paradrops three Terror Drones anywhere on the battlefield. Unlike the Tank Drop, the Terror Drop is delivered by a much faster MiG Transport that cannot be attacked.
Note that the Industrial Plant does not reduce the Terror Drop's cost, as the drones are delivered, not produced.
The AI will use Terror Drop to target a clear space close to the center of the enemy base. If all enemies are defeated, the AI will target their own base, with the same circumstances.
The Terror Drop is first usable in the campaign in The Raven.
Since the MiG transport is not adapted for use in the vacuum, Terror Drop (alongside Tank Drop) cannot be used in Earthrise.