Within the Dominion Armed Forces, whenever a strike force is deployed planetside, the engineering bay is one of two key research facilities to be established in a field base as soon as possible (the other being the armory), improving the quality of infantry weapons.[2] During the Great War, these structures were equipped with the ability to lift off and move to a new location. However, after the Brood War, the engineering capabilities were improved, increasing the personnel of the structure and intricacy of their work. Because of this, engineering bays were no longer cleared for flight.
The Dominion Special Forces utilize AIs in their experimental engineering bays, which increase their research speed by fighting each other in simulated battles.[3]
The weapons plant was a terran structure in the StarCraft beta. It was cancelled before the game's full release.[4] It was later turned into the engineering bay.[5]
Attack upgrades improve attack cooldown of affected units by 5% per level.[6]
These self-replicating ultra capacitors reduce the reload time of weapons and systems. Now each of the weapon upgrades at the armory and engineering bay increases attack speed by 5% in addition to increasing damage.
Armor upgrades increase health of affected units by 5% per level.[6]
We have created a new lightweight alloy called vanadium. Vanadium diffuses weapon impacts much more efficiently than traditional armor plating, and it better preserves the life of our units. Now each of the armor upgrades in the armory and engineering bay increases unit life by 5% in addition to increasing armor.
All structures repair themselves to 50% life. All structure fires are automatically put out.
This all-in-one safety system automatically dispatches robotic drones to put out any fires and perform basic repairs on damaged structures. Although these drones are effective at doing basic repairs, they do not have a strong enough AI to perform the more delicate repairs needed to restore a structure past half life.[7]
100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 160
Level 2
Cost
175 Mastery: -3.5 per Research Resource Cost mastery point. Down to a minimum 70 175 Mastery: -3.5 per Research Resource Cost mastery point. Down to a minimum 70 190
Level 3
Cost
250 Mastery: -5 per Research Resource Cost mastery point. Down to a minimum 100 250 Mastery: -5 per Research Resource Cost mastery point. Down to a minimum 100 220
Increases the armor of terran infantry. At level 10, increases the life of terran infantry by 10% per level.
Usage
Passive
Campaign Acquisition
Unlock
Initially available.
Acquisition
Purchased from
Engineering bay
Hotkey
A
Level 1
Cost
100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 160
Level 2
Cost
175 Mastery: -3.5 per Research Resource Cost mastery point. Down to a minimum 70 175 Mastery: -3.5 per Research Resource Cost mastery point. Down to a minimum 70 190
Level 3
Cost
250 Mastery: -5 per Research Resource Cost mastery point. Down to a minimum 100 250 Mastery: -5 per Research Resource Cost mastery point. Down to a minimum 100 220
Bunkers gain +2 capacity and command centers gain +5 capacity.
Usage
Passive
Campaign Acquisition
Unlock
Initially available.
Acquisition
Purchased from
Engineering bay
Hotkey
N
Cost
100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 60
100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 100 Mastery: -2 per Research Resource Cost mastery point. Down to a minimum 40 60
Reduces the cooldown of Reapers KD8 Charge by 10. When Reapers are killed, they throw 8 grenades (1 under him and 7 around him) the killing unit.
Usage
Notes
Mastery: When killed, throw 15 grenades (1 under him, 7 around him close and 7 around him away) with a chance to +1.5 per Mastery point. (up to a maximum 45% chance)
Reduce Sentinel Missile Cooldown by 20 seconds. When killed the Widow Mine will launch 5 Sentinel Missiles at random nearby targets that deal 10 (+10 vs. shields) area damage.
Usage
Notes
Mastery: When killed, launch 10 Sentinel Missiles at random nearby targets with a chance to +1.5% per Mastery point. (up to a maximum 45% chance)
Hellions and Hellbats transform 75% faster. When Hellions are killed, nearby allied units in radius 3.5 gain 25% movement and 15% attack speed for 15 seconds.
Usage
Duration
15
Notes
Mastery: when killed, nearby allied units in radius 3.5 gain 50% movement and 30% attack speed for 15 seconds with a chance to +1.5% per Mastery point. (up to a maximum 45% chance)
Hellions can launch a bomb that deals 20 damage to the target unit. Nearby enemies have their movement speed reduced by 25% and attack range reduced by 3 for 5 seconds. Can be set to autocast.
Hellbat movement speed is increased by 50%. When Hellbats are killed, they ignite the surrounding area. Enemies in the fire run around in fear for 3 seconds in radius 3.
Usage
Duration
3
Notes
Mastery: when killed, enemies in the fire run around in fear for 3 seconds in radius 4.24 with a chance to +1.5% per Mastery point. (up to a maximum 45% chance)
As of patch 4.7.1, Neosteel Frame and Structure Armor were merged into an upgrade called Neosteel Armor.
The StarCraft II engineering bay was designed to be a more simple structure than its predecessor. It was decided to make it a grounded structure as per the belief that only unit-producing structures should be able to lift off.[8]
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