Grumium 3151.svg
System Information
X:Y Coordinates-4.923 : 186.846[e]
Spectral classF1V[1]
Recharge time172 hours[1]
Recharge station(s)Nadir[1]

The Grumium system was home to at least one habitable world, Grumium II, and as of 3145 was located in the Skandia Province of the Rasalhague Dominion.[2][3]

System Description[edit]

The Grumium system is located near the Dehgolan and Karbala systems.[2][3] The Grumium system consists of a class F1V primary orbited by at least two worlds. During the late thirty-first century, a recharge station was in place at the system nadir jump point.[1]

System History[edit]

The Grumium system was settled during or shortly after the First Exodus from Terra and was a member of the Tamar Pact prior to the formation of the Lyran Commonwealth in the twenty-fourth century.[4][5]

Political Affiliation[edit]

Grumium II[edit]

System position2nd[1]
Jump Point distance20.26 days[1]
Surface gravity1.10[1]
Atmospheric pressureStandard (Breathable)[1]
Equatorial temperature34°C (Temperate)[1]
Surface water52%[1]
Highest native lifeMammals[1]
Landmasses3 (Crater, Draco, McAdoo)[1]
History and Culture
Population350,000,000 (3079)[1]
Government and Infrastructure
HPG ClassB[1]

Grumium II, more commonly known simply as Grumium, is the second planet in the Grumium system and has a single moon.[1]

Planetary History[edit]

Apocryphal Content Starts

The information after this notice comes from apocryphal sources; the canonicity of such information is uncertain.
Please view the reference page for information regarding their canonicity.

Down on their luck and unable to garner any legitimate contracts, Death's Legion went rogue and looted a House Kurita weapons facility. The treasure trove of stolen Lostech items was stored on Grumium and placed on the black market. Sebastian Spears of Interstellar Expeditions learned the location of their hidden base and sent Nik's Cavaliers, now under the command of Jake Mason, to eliminate the rogue mercenaries so that Spears' salvage teams could recover the merchandise for himself, using it to fund their effort to find and hunt down Black Inferno and their benefactor, Kenzo Yamata of ComStar.[50]

Apocryphal Content Ends

Fourth Succession War[edit]

Grumium was one of the worlds invaded by the Lyran Commonwealth during Operation GÖTTERDÄMMERUNG, the major Lyran Commonwealth offensive of the Fourth Succession War. Grumium was a target of the follow-up exploitation phase that followed the first wave of attacks; the exploitation phase was initiated following orders from Archon Katrina Steiner on 21 October 3028,[23] and Grumium was invaded by a task force consisting of the Third Donegal Guards, the Fourth Lyran Regulars and the Twenty-second Skye Rangers.[51] The conquest of Grumium was considered a significant emotional victory, as Grumium had been a Lyran world prior to being conquered by the Combine.[23]


During the Jihad, Grumium was the site of one of the most damaging protests against the merging of the Rasalhague population and Clan Ghost Bear. On 7 March 3071, the local First Grumium Armored Militia had to remove their own countrymen from the grounds of the Frihet Training Academy, after a major protest against the détente between the Ghost Bears and the local population saw rebel cadets from the academy take over the academy grounds.[52]

Grumium Creations, the notable defense manufacturer on Grumium, was experiencing problems as the Jihad drew to a close. No longer able to export to ComStar, the facilities had already closed down their Crockett production lines, but were continuing to produce Cyclops and Viking BattleMechs as well as Kobold battle armor, but had been unable to attract or obtain any funding to upgrade its remaining production lines, and it was unclear if the company would be able to continue operating.[1]

Military Deployment[edit]




  • First Grumium Armored Militia[52]


Apocryphal Content Starts

The information after this notice comes from apocryphal sources; the canonicity of such information is uncertain.
Please view the reference page for information regarding their canonicity.

In the MechWarrior 5: Mercenaries Campaign Mission "Blood and Treasure," Grumium is depicted as an iron oxide biome with poor visibility.[50]

Apocryphal Content Ends

Planetary Locations[edit]

  • Frihet Training Facility: a military training center for MechWarriors, armored vehicle crews and conventional infantry forces[1]
  • Gibbs: the location of the Grumium Creations facilities on McAdoo[1]
  • Grumdale: the planetary capital city, located on Draco[1]
  • Hel: an arid badlands area on crater[1]
  • Herculis: the location of the Frihet Training Facility on Draco[1]

Industrial Centers[edit]

Map Gallery[edit]

Nearby Systems[edit]

Closest 52 systems (51 within 60 light-years)
Distance in light years, closest systems first:
Dehgolan 16.0 Karbala 21.3 Camlann 21.9 Al Hillah 22.0
Ueda 23.0 Glenlivet 23.0 Shirotori 23.2 Tukayyid 23.6
Meacham 23.8 Fefferfer 27.5 Port Moseby 27.9 Fatima 28.6
Orestes 28.6 Lothan 34.2 Fort Loudon 35.3 Ramsau 36.0
Morningside 36.1 Dalkeith 36.2 Blue Diamond 37.1 Buckminster 39.3
Caldrea 39.3 Dove 39.5 Sakhalin 40.0 Jabuka 40.2
Altenmarkt 41.4 Aubisson 41.4 Trolloc Prime 41.6 Accrington 42.2
Pilkhua 43.1 Diosd 43.8 Rasalgethi 44.8 Rubigen 47.1
Najha 47.3 Ganshoren 48.0 Symington 51.5 Quarell 52.4
Shionoha 52.5 Sulafat 53.3 Carse 53.3 Kelenfold 53.7
Phalan 54.6 Chandler 55.8 Numki 55.9 Nox 56.0
Juniper 57.0 Utrecht 57.2 Tomans 58.1 Kingtribel 58.1
Toffen 58.2 Eaglesham 59.5 Chimpaw 59.6 Shardayne 61.0


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 Objectives: The Clans, p. 35: "Grumium"
  2. 2.0 2.1 2.2 Era Report: 3145, p. 39
  3. 3.0 3.1 3.2 Field Manual: 3145, p. VI: "Inner Sphere - [3145] Map"
  4. 4.0 4.1 Handbook: House Kurita, p. 18
  5. 5.0 5.1 5.2 Handbook: House Steiner, p. 13
  6. Handbook: House Steiner, p. 25
  7. Handbook: House Kurita, p. 31
  8. Historical: Reunification War, p. 159
  9. Era Report: 2750, p. 37
  10. Field Manual: SLDF, p. xi: "Inner Sphere - [2764] Map"
  11. Historical: Liberation of Terra Volume 1, p. 11
  12. Handbook: House Steiner, p. 36
  13. Handbook: House Kurita, p. 43
  14. Historical: Liberation of Terra Volume 2, pp. 122–123
  15. 15.0 15.1 House Kurita (The Draconis Combine), p. 71
  16. Handbook: House Kurita, p. 53
  17. Handbook: House Steiner, p. 40
  18. House Kurita (The Draconis Combine), foldout: "Draconis Combine Map - [3025]"
  19. Handbook: House Kurita, p. 64
  20. House Steiner (The Lyran Commonwealth), foldout: "Lyran Commonwealth Map - [3025]"
  21. Handbook: House Steiner, p. 47
  22. Handbook: House Davion, p. 70
  23. 23.0 23.1 23.2 NAIS The Fourth Succession War Military Atlas Volume 1, p. 59: "Follow-up Invasions"
  24. Handbook: House Steiner, p. 56
  25. Handbook: House Kurita, p. 66
  26. Handbook: House Davion, p. 72
  27. Historical: Brush Wars, p. 103
  28. Handbook: House Steiner, p. 56
  29. Handbook: House Kurita, p. 68
  30. Handbook: House Davion, p. 76
  31. Historical: War of 3039, p. 133
  32. Era Report: 3052, p. 11
  33. Era Report: 3052, p. 23: "Inner Sphere [3052] Map"
  34. Handbook: House Steiner, p. 61
  35. Handbook: House Kurita, p. 71
  36. Era Report: 3062, p. 11
  37. Era Report: 3062, p. 29
  38. Handbook: House Steiner, p. 70
  39. Handbook: House Kurita, p. 74
  40. Handbook: House Davion, p. 82
  41. Jihad: Final Reckoning, p. 43
  42. Jihad Secrets: The Blake Documents, p. 65
  43. Field Report: Clans, p. 25
  44. Field Report: LAAF, p. 19
  45. Field Report: DCMS, p. 21
  46. Jihad: Final Reckoning, p. 63
  47. Field Manual: 3085, p. 127
  48. Era Report: 3145, p. 11
  49. Shattered Fortress, pp. 102–103
  50. 50.0 50.1 MechWarrior 5: Mercenaries, Campaign Mission 13: "Blood and Treasure"
  51. NAIS The Fourth Succession War Military Atlas Volume 1, pp. 44–45: "Operation GÖTTERDÄMMERUNG"
  52. 52.0 52.1 Jihad Hot Spots: 3076, p. 15: "Timeline of the Jihad"
  53. 20 Year Update, p. 51: "KungsArme Deployment Table"
  54. Objective Raids, p. 72: "Unit Note"
  55. Field Manual: 3085, p. 128: "Deployment Table - 3085"
  56. Field Manual: 3145, p. 172: "Tundra Galaxy"
  57. Objectives: The Clans, p. 35: "Grumium Creations"