Point Defense Drone

The Point Defense Drone was a light-air Terran unit removed in the 4.0.0 patch, it is deployed by a Raven at the cost of 100 energy. The Drone is immobile and cannot attack, but will negate specific enemy projectiles near itself, protecting allied units. The Drone spawns with 200 energy, which allows for up to 20 attacks to be negated. Point Defense Drones can be constructed within 3 range of their host Raven. Once deployed, the Raven can leave the area, and the Drone will remain for its 14-second duration.

Units with multiple attacks, such as the Phoenix or Thor, require 10 energy per each projectile fired.
The Point Defense Drone can be destroyed by attacking the drone itself with units which are not countered by its defensive laser, listed below.
The Point Defense Drone regenerates energy almost twice as fast as other caster units (1.4 energy per second vs 0.7875 energy per second). This allows it to defend against an additional projectile every 7 seconds.
Although the unit lists Ship Plating as its armor type, the Point Defense Drone’s armor is only affected by the Engineering Bay’s Building Armor upgrade.
Is considered a building and mechanical for spell targeting purposes (Immune to the Ghost’s Snipe and High Templar’s Psionic Storm spells. Also targetable by Corruptor’s Caustic Spray spell)
Can be affected by a Ghost’s EMP Round spell, reducing the number of Point Defense Lasers available.
Can be affected by a High Templar’s Feedback spell, destroying it almost every time due to its low HP and high energy.
As a mechanical unit, the Point Defense Drone can be repaired by friendly SCVs.
Durable Materials allows the Point Defense Drone to be placed pre-emptively with a lower risk that it will go un-used.
Will defend against any enemy projectiles that pass through its protective range, even if the attacking and defending units are outside of said range.
Will consume energy defending attacks from fake units created by Hallucination.
Point Defense Laser marginally scales as the game progresses, because it negates upgrade damage (In a Marauder vs Marauder battle, a single PDD would stop 400 damage with no Infantry Weapons upgrades. With +3 Infantry Weapons researched, the PDD stops 520 damage, a 120 damage difference).
Ranged units which also have a melee attack animation, i.e. Roaches, Hydralisks and Locusts, will not trigger Point Defense Laser when using the alternate animation. Queens also do not trigger pdd when using their ground attack at range of less than 3.
Multiple drones will not attack same projectile.
As an important note the PDD no longer stops Broodlings fired from Brood Lords (Since Patch 1.3.3)
Another important note is that the while Cyclones regular attacks will be shot down by PDDs, the projectiles fired by Lock On will not be stopped by the PDD.

TERRAN

General Information

The Terrans can neither boast impressive technologies nor unbeatable masses, they seem to be the least dangerous race in the Starcraft universe. However, this is also their strength, often underestimated by the enemy, they can attack from ambush and thus take advantage of the surprise effect. The Terran forces are often formed from prisoners who want to shorten their sentence. These fighters, assigned to the infantry, are often poorly trained, but have an iron will to fight. Smaller war machines, such as the infamous tanks, are often used to support the foot troops.

The Terrans’ greatest enemy seems to be the Terrans themselves: Shattered by internal conflicts and wars, the Terrans have never been able to form a cohesive army to reach their full potential.