"Is it a bird? Is it a plane? No. It's a MULE."

The Mobile Utility Lunar Excavator[1] (MULE) is an experimental terran mining robot.


The MULE is still in the prototype stage and has a limited battery life.[2] The Dominion Fleet deploys these machines via drop pod. Once deployed, a MULE will collect resources three times faster than an SCV—a fact that some SCV pilots don't take kindly to hearing.[3]

Game Unit

MULEs are summoned by the orbital command's Calldown: MULE ability. Each drop pod contains one MULE. A MULE takes about three times longer to finish mining a load than an SCV, but retrieves 25 minerals per load, meaning that it collects minerals approximately twice as quickly as an SCV (SCVs retrieve 5 minerals per load). A MULE and an SCV may mine from the same mineral patch simultaneously. MULEs last 64 seconds before shutting down, and can be called down anywhere on the map with player vision. As it takes slightly under 64 seconds for orbital commands to recharge 50 energy, one orbital command can call down a new MULE as the previous one expires.

MULEs mine the same amount from high yield mineral patches.[4]

A MULE summoned directly onto a mineral patch will harvest 270 minerals before running out of energy.[5]

In addition to mining resources, MULEs can also be used to repair units. While this is an inefficient way to use them in comparison to using them to mine, they can be used in emergencies to keep mechanical units alive during battles. Another use of MULEs is to drop them near enemy units that inflict friendly splash damage, such as siege tanks, causing disruption and friendly fire.


MULECalldown SC2 Icon1
Calldown: MULE

An orbital command summons one MULE via drop pod. If the ability is targeted on a mineral patch the MULE will begin mining automatically, extracting 45 minerals per trip. The ability may be used only on areas uncovered by the fog of war.

Hotkey E
Cost 50 Energy Terran SC1
Duration 64Time SC2 Game1


Repair SC2 Icon1

Restores the hit points of a mechanical unit or building, terran or protoss. Repairing costs resources.

The ability can be autocast.

Cost Varies Minerals Terran SC1 Varies Gas Terran SC1


Purchased from Engineering bay
Hotkey A
Level 1
Cost 100 Minerals Terran SC1 100 Gas Terran SC1 114Time SC2 Game1
Level 2
Cost 175 Minerals Terran SC1 175 Gas Terran SC1 136Time SC2 Game1
Required Armory
Level 3
Cost 250 Minerals Terran SC1 250 Gas Terran SC1 157Time SC2 Game1
Required Armory

Wings of Liberty

Damaged mechanical units recover hit points when out of combat, at a rate of 0.6015 each second.[6]

Our ship and vehicle hulls are now made from a material called Regenerative Bio-Steel. This material uses internal nanobots to slowly repair any damage the hull sustains. While this regeneration process is much slower than conventional SCV repairs, it can be the difference between life and death if no SCVs are available.

Campaign Acquisition
Acquired from Hyperion laboratory for 20 zerg research points
SC2 Lab VanPlating Icon
Vanadium Plating

Armor upgrades increase health of affected units by 5% per level.[7]

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.

Campaign Acquisition
Acquired from Hyperion laboratory for 5 protoss research points

Co-op Missions

MULEs are exclusive to Jim Raynor in Co-op Missions, and can be spawned from the orbital command.

MULEs are a possible gift players can gain during the "Gift Exchange" mutator. Each player gains two MULEs with Christmas hats.[8]

VanadiumPlating SC2CoopIcon
Vanadium Plating

Armor upgrades at the armory and engineering bay increase the life of affected units in addition to increasing their armor.

Campaign Acquisition
Unlock Reach Raynor Level 10.


The following section contains information from a previous version of StarCraft II which is no longer valid.

The MULE's attack[9] was removed by April 2009.[10] Its repair ability was also removed by April 2009[10] but later reinstated.

MULEs carried three times more minerals than SCVs.[11]

MULEs harvested 42 minerals per trip from rich mineral patches prior to patch 1.4.3.

MULEs were temporarily removed from Legacy of the Void in patch 2.5.5.[12] They were returned in the subsequent update patch, albeit with the calldown now set to autocast.[13] They were returned to how they functioned in Heart of the Swarm in a subsequent update.[14]

In a Legacy of the Void design update, MULEs were planned to be able to mine vespene gas, but would have lose efficiency if more than one MULE was assigned to a refinery. They would have harvested 10 gas per trip. To offset this, their ability to harvest minerals was to be reduced to 20 per trip. This change was reverted before it could be implemented in-game.[15]


Mule xing Mule X'ing

10 Achievement SC2 Game1


Call down 30 MULEs in a single Unranked or Ranked game.

Heroes of the Storm

Heroes DevLog2

The following section contains information from Heroes of the Storm and is not canon to StarCraft continuity

MULEs appear in Heroes of the Storm as a talent upgrade for support and specialist heroes, and can be called down to repair structures.[16]


  • The MULE's portrait bears similarity to HAL 9000.


  1. shinbanryu​. 2010-05-02. 맵소스를 직접 찍었습니다. Korean fan's blog. Accessed 2010-05-02.
  2. Karune. 2009-02-18. StarCraft II Q&A - Batch 49. StarCraft II General Discussion Forum. Accessed 2009-02-18.
  3. Barba, Rick. StarCraft Field Manual (hardcover). Insight Editions, November 17, 2015.
  4. Blizzard Entertainment. 2012-02-21. Patch 1.4.3 Now Live. Blizzard Entertainment. Accessed 2012-02-22.
  5. StarCraft Legacy staff. 2010-03-08. Macro in StarCraft II Beta - First Look. StarCraft Legacy. Accessed 2010-03-16.
  6. Blizzard Entertainment. StarCraft II: Wings of Liberty. (Activision Blizzard). PC. Zerg research (in English). 2010.
  7. Blizzard Entertainment. StarCraft II: Wings of Liberty. (Activision Blizzard). PC. Protoss research (in English). 2010.
  8. Blizzard Entertainment. StarCraft II: Legacy of the Void. (Activision Blizzard). PC. Mission: Co-op Missions Mutator, Violent Night (in English). 2016-12-19.
  9. Karune. 2009-02-18. StarCraft II Q&A - Batch 49 (page 2). StarCraft II General Discussion Forum. Accessed 2009-02-18.
  10. 10.0 10.1 True, as long as you have line of sight on the spot, you can drop MULE. On the enemy's Siege Tanks, on a ramp, etc. However MULE can't attack or repair. Cydra. 2009-04-23. Blues -- can the OC call down mules anywhere? StarCraft II General Discussion Forum. Accessed 2009-04-24.
  11. Browder, Dustin and Shadowie. 2009-05-01. Fan Site Q&A #3 - SC2Pod. SC2pod. Accessed 2009-05-01.
  12. 2015-08-20, Legacy of the Void Beta Patch 2.5.5. Blizzard Entertainment, accessed on 2015-09-03
  13. 2015-09-03, Legacy of the Void Beta Balance Update -- September 3, 2015. Blizzard Entertainment, accessed on 2015-09-06
  14. 2015-09-17, Legacy of the Void Beta Balance Update -- September 17, 2015. Blizzard Entertainment, accessed on 2015-09-30
  15. 2017-08-17, StarCraft II Multiplayer - Major Design Changes. Blizzard Entertainment, accessed on 2017-08-20
  16. Blizzard Entertainment. Heroes of the Storm (Blizzard Entertainment) (in English). June 2, 2015