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Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)

← 3135
Errai nearby systems
Errai nearby systems
(Map Legend)
System Information
X:Y Coordinates 52.512 : 3.478[e]
Spectral class M6IV[1]
Planets 7[1]

The Errai system is the location of at least one inhabited world, Errai II, and as of 3145 was located in the Al Na'ir Prefecture of the Dieron Military District within the Draconis Combine.[2][3]

System Description[edit]

The Errai system is located near the Helen and Small World systems[2][3] and consists of a class M6IV primary orbited by seven planets.[1]

System History[edit]

The Errai system was settled during the First Exodus from Terra.[4]

Political Affiliation[edit]

Errai II[edit]

Errai II
Orbital view
Orbital view
System position 2[1]
Jump point
2 days[1]
Moons None[1]
Surface gravity 1.02[1]
Atmospheric pressure Standard (Breathable)[1]
Equatorial temperature 35°C[1]
Surface water 54%[1]
Highest native life Amphibians[1]
Reference Year 3130[1]
Ruler Yoshimaru Hitomi, Governor (3130)[1][50]
Minobu Naganishi, Legate (3130)[1][50]
Capital Errai Prime[1]
Population 301,678,000[1][50]

Errai II - more commonly known simply as Errai - is the second of seven planets in the system.[1]

Planetary History[edit]

Early History[edit]

Errai was settled with the intent of becoming a major industrial world, and it succeeded. By the twenty-fourth century Errai was already a wealthy independent world, and shortly after Errai had signed a mutual defense pact with the nearby worlds of Helen and Quentin it was targeted for conquest by Director-General James McKenna of the newly-formed Terran Hegemony. Having secured his hold over all of the worlds within the rump state of the Terran Alliance, McKenna began a "Campaign of Persuasion" to bring other former Alliance worlds and independent worlds into the Hegemony through military force, and the three allied worlds of Errai, Helen and Quentin were his first targets.[4]

McKenna attacked the Errai system with a large fleet of WarShips, and despite knowing that there was little chance of resisting the invasion the leaders of each of the three allied worlds planned to teach McKenna a lesson; all three worlds converted fleets of cargo and interplanetary courier ships into fighting vessels by adding lasers and missile tubes to battle in space, and all three worlds beefed up their ground forces with large militia forces of trained personnel augmented by volunteers. The colonists on Errai fought a dogged, even fanatical, campaign of resistance against the Hegemony Armed Forces before finally being conquered, and the resistance offered by those on Errai taught the HAF a number of harsh lessons.[4]

Amaris Civil War[edit]

Errai prospered during the Star League era, with the planet gaining or developing a wide range of local companies manufacturing products ranging from fusion reactors, IndustrialMechs, heavy industrial equipment and electronics.[1]

When Stefan Amaris launched Operation APOTHEOSIS, his usurpation of the Terran Hegemony, one of the initial stages of his campaign was to secure naval domination of the systems within the Hegemony. Rim Worlds Republic naval forces consisting of WarShips, DropShips and AeroSpace Fighters attempted to secure the two major jump points in every inhabited system, including Errai.[51]

The RWR's efforts were frustrated in the Errai system, where a large SLDF supply convoy consisting of critical supplies and replacement troops destined for the forces engaged in fighting the Periphery Uprising was being assembled under the command of Commodore Justine Campos. A task force of five RWR WarShips attempted to interdict the convoy, but Commodore Campos drove her lighter, six-strong WarShip detachment directly into the heart of the RWR formation. While the SLDF task force was at a significant disadvantage in terms of tonnage, the ships were all fresh from the fighting on the Periphery front, making them considerably sharper and more experienced than their attackers. The SLDF forces lost four ships but destroyed all five attacking vessels; the two surviving light SLDF WarShips then fought a ten-minute last stand at the Errai nadir jump point, buying time against the flotillas of RWR DropShips and Fighters to allow the supply convoy to escape. The heavily-laden supply vessels were all able to jump out of the system or proceed into deep space to rendezvous and then jump away, although neither SLDF WarShip survived.[51]

After the liberation of Terra SLDF General Jack Lucas retired to Errai, having been placed on convalescent leave as a result of combat stress and his increasingly hostile attitude towards enemy personnel. Lucas began a new career in politics, and was quickly elected to the position of Planetary Governor. As Governor Lucas used a combination of his forceful personality and his larger-than-life reputation earned as commander of the SLDF Third Army to help rebuild Errai, but the arrival of the Succession Wars soured him permanently on warfare, and he retired from public life to serve as a parish priest on Errai and then Northwind.[52]

Second Succession War[edit]

The Federated Suns occupied Errai early in the Succession Wars, leading to Errai briefly experiencing a surge in commercialism and the establishment of a notable number of casinos and nightclubs. This in turn led to local mobs taking over or influencing the new casinos and nightclubs, leading to an era of widespread crime and corruption that came to characterize Errai's political and business dealings.[1]

Fourth Succession War[edit]

The Draconis Combine conquered Errai during the Fourth Succession War and made an effort to root out the embedded corruption and install a government more in keeping with the typical Combine style. As a part of these efforts many of the nightclubs and casinos established during the previous three centuries vanished, but a combination of entrepreneurs and engineers from the Combine reopened and upgraded a local AgroMech plant under the name of the Maltex Corporation, a former Star League era BattleMech manufacturer. This upgraded factory went on to produce the new Hatamoto-Chi, based loosely on the Charger BattleMech.[1] Other sources don't show Errai changing hands in either the Fourth Succession War or the War of 3039.

Clan Invasion[edit]

After the formation of the Second Star League, the Maltex Corporation received investment capital from Comstar to reconstruct their factories on the world for the production of Wyvern and Thug-class BattleMechs. By 3064, the factories were in production again.[53][54] Throughout the Federated Commonwealth Civil War, Errai was garrisoned by Harlock's Warriors. The world was raided by the Combine in 3068. In 3069, the world came under attack by the Word of Blake, and after a long guerrilla campaign, Harlock's Warriors fled the world in 3070 due to lack of supplies.[55][56] Maltex continued to produce IndustrialMechs and BattleMechs into the Dark Age, although at a reduced rate of production to that seen during Operation REVIVAL. Errai was also home to a relatively small corporation named Null-Gee Metals that operated a large number of asteroid mining colonies within the Errai system asteroid belt. Like Maltex, Null-Gee Metals was based on Carrigan.[1]

Planetary Rulers[edit]


  • Planetary Governor Minobu Naganishi[1]
  • Planetary Legate Yoshimaru Hitomi[1]

Military Deployment[edit]




  • Northwind Highlanders[59]



  • Harlock's Warriors[61]



Errai has two major continents, the primary continent being Carrigan and the secondary continent being Hallens.[1]

Planetary Locations[edit]

  • Erra Prime: The planetary capital city, located on Hallens.[1]
  • Red Forrest:[63]

Industrial Centers[edit]

Map Gallery[edit]

Nearby Systems[edit]

Closest 80 systems (80 within 60 light-years)
Distance in light years, closest systems first:
Helen 8.2 Small World 10.5 Quentin 11.0 Lockdale 12.3
Pokhara 16.6 Towne 17.3 Addicks 19.4 Northwind 19.5
Deneb Kaitos 20.4 Ingress 22.3 Nirasaki 24.1 Deneb Algedi 25.3
Ankaa 25.6 Ruchbah 26.7 Murchison 27.6 Sheratan 27.6
Fletcher 27.6 Saffel 28.2 Hean 28.6 Al Na'ir 28.8
Epsilon Indi 30.1 Nashira 30.5 New Stevens 31.6 Fomalhaut 31.6
Ozawa 32.3 Kawich 33.0 Styx 34.6 Basalt 35.2
New Britain 35.7 Nopah 37.4 Telos 37.8 Biham 38.4
Galatia 39.7 Tigress 39.8 Caph 39.8 Ancha 39.9
New Florence 41.0 Woodstock 41.1 Dieron 41.9 Epsilon Eridani 42.2
Bryant 42.7 Sadachbia 42.9 Ronel 43.6 Alpha Eridani 43.6
Acamar 44.0 Tybalt 44.4 Athenry 44.5 Altair 44.9
Bharat 45.6 Kervil 46.3 Skat 47.0 Halstead Station 47.4
Terra Firma 47.7 New Home 48.1 Pike 48.2 Hamal 48.5
Markab 49.1 Agador 51.2 Keid 51.3 Sol 52.6
Yangtze 52.7 Asta 53.2 New Rhodes 53.5 Bex 53.5
Rio 53.6 Miyazaki 54.0 Azha 55.0 Angol 55.1
Rigil Kentarus 55.4 Arboris 55.8 Chaville 55.9 Slocum 56.0
Sirius 56.2 Brownsville 56.8 Shinonoi 57.4 Cylene 57.6
Killbourn 58.4 Mallory's World 58.9 Procyon 59.4 Dyev 59.9


  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 1.24 1.25 Dark Age: Republic Worlds (3130), p. 49, "Errai World Profile"
  2. 2.0 2.1 2.2 Era Report: 3145, p. 39, "Inner Sphere - [3145] Map"
  3. 3.0 3.1 3.2 Field Manual: 3145, p. VI, "Inner Sphere - [3145] Map"
  4. 4.0 4.1 4.2 4.3 4.4 The Star League, p. 16, "Terra's Errant Flock"
  5. Handbook: House Marik, p. 16, "Free Worlds League Founding [2271]"
  6. Handbook: House Kurita, p. 18, "Draconis Combine Founding - [2319] Map"
  7. Handbook: House Steiner, p. 25, "Lyran Commonwealth after Age of War - [2571] Map"
  8. Handbook: House Kurita, p. 31, "Draconis Combine after Age of War - [2571] Map"
  9. Historical: Reunification War, p. 159, "Inner Sphere - [2596] Map"
  10. Era Report: 2750, p. 37, "Inner Sphere - [2750] Map"
  11. Field Manual: SLDF, "Inner Sphere - [2764] Map"
  12. Historical: Liberation of Terra Volume 1, p. 11, "Inner Sphere - [2765] Map"
  13. 13.0 13.1 Historical: Liberation of Terra Volume 1, p. 138, "Operation LIBERATION Wave 1 [July 2772 - December 2774]"
  14. Handbook: House Kurita, p. 43, "Draconis Combine after First Succession War - [2822] Map"
  15. Handbook: House Steiner, p. 36, "Lyran Commonwealth after First Succession War - [2822] Map"
  16. Historical: Liberation of Terra Volume 2, p. 122-123, "Inner Sphere - [2822] Map"
  17. Handbook: House Davion, p. 60, "Federated Suns after Second Succession War - [2864] Map"
  18. Handbook: House Kurita, p. 53, "Draconis Combine after Second Succession War - [2864] Map"
  19. Handbook: House Steiner, p. 40, "Lyran Commonwealth after Second Succession War - [2864] Map"
  20. House Davion (The Federated Suns), "Federated Suns Map - [3025] Map"
  21. Handbook: House Davion, p. 70, "Federated Suns after Third Succession War - [3025] Map"
  22. House Kurita (The Draconis Combine), "Draconis Combine Map - [3025]"
  23. Handbook: House Kurita, p. 64, "Draconis Combine after Third Succession War - [3025] Map"
  24. House Steiner (The Lyran Commonwealth), "Lyran Commonwealth Map - [3025]"
  25. Handbook: House Steiner, p. 47, "Lyran Commonwealth after Third Succession War - [3025] Map"
  26. Handbook: House Davion, p. 71, "Federated Suns after Fourth Succession War - [3030] Map"
  27. Handbook: House Steiner, p. 56, "Lyran Commonwealth after Fourth Succession War - [3030] Map"
  28. Handbook: House Kurita, p. 66, "Draconis Combine after Fourth Succession War - [3030] Map"
  29. Handbook: House Davion, p. 76, "Federated Suns after War of 3039 - [3040] Map"
  30. Handbook: House Steiner, p. 56, "Lyran Commonwealth after War of 3039 - [3040] Map"
  31. Handbook: House Kurita, p. 68, "Draconis Combine after War of 3039 - [3040] Map"
  32. Historical: War of 3039, p. 133, "Inner Sphere - [3040] Map"
  33. Era Report: 3052, p. 11, Inner Sphere - [3050] Map
  34. Era Report: 3052, p. 23, Inner Sphere - [3052] Map
  35. Handbook: House Steiner, p. 61, "Lyran Commonwealth after Clan Invasion - [3052] Map"
  36. Handbook: House Kurita, p. 71, "Draconis Combine after Operation REVIVAL - [3052] Map"
  37. Era Report: 3062, p. 11, Inner Sphere - [3057] Map
  38. Handbook: House Davion, p. 78, "Federated Suns after Operation Guerrero - [3058] Map"
  39. Era Report: 3062, p. 29, Inner Sphere - [3063] Map
  40. Handbook: House Davion, p. 82, "Federated Suns after FedCom Civil War - [3067] Map"
  41. Handbook: House Steiner, p. 70, "Lyran Alliance after FedCom Civil War - [3067] Map"
  42. Handbook: House Kurita, p. 74, "Draconis Combine after FedCom Civil War - [3067] Map"
  43. Jihad: Final Reckoning, p. 43, "Inner Sphere - [3067] Map"
  44. Jihad Secrets: The Blake Documents, p. 65, Inner Sphere - [3075] Map
  45. Field Report: LAAF, p. 19, "Lyran Alliance Armed Forces Deployment Map - August 3079"
  46. Field Report: Clans, p. 29, "Terran Corridor Clans Deployment Map - [August 3079]"
  47. Jihad: Final Reckoning, p. 63, "Inner Sphere - [ 3081] Map"
  48. Field Manual: 3085, p. 127, "Inner Sphere Map - [3085] Map"
  49. Era Report: 3145, p. 11, "Inner Sphere - [3135] Map"
  50. 50.0 50.1 50.2 Dark Age: Republic of the Sphere, p. 8 "Prefecture III"
  51. 51.0 51.1 Historical: Liberation of Terra Volume 1, p. 72, "Command of the Stars"
  52. Historical: Liberation of Terra Volume 2, p. 19, "Jack Lucas"
  53. Technical Readout: 3050 Update p. 196, "WVE-5N Wyvern"
  54. Technical Readout: 3050 Update p. 216, "THG-11E Thug"
  55. Dawn of the Jihad, p. 57, "Lest we Forget"
  56. Mercenaries Supplemental Update, p. 67, "Harlock's Warriors"
  57. 57.0 57.1 57.2 57.3 57.4 57.5 57.6 Historical: War of 3039, p. 141, "Deployment Table"
  58. Technical Readout: 3039, p. 166, "BNC-3E Banshee - El Guapo"
  59. 59.0 59.1 20 Year Update, p. 19, "Federated Commonwealth Deployment Table"
  60. Field Manual: Mercenaries, p. 107, "Mercenary Deployment Table"
  61. Mercenaries Supplemental , p. 67, "Mercenary Deployment Table"
  62. Field Manual: 3145, p. 64, "Draconis Combine Mustered Soldiery Deployment Table - 3145"
  63. Sorenson's Sabres (scenario pack), p. 29
  64. Experimental Technical Readout: Gunslingers, p. 6
  65. Objective Raids, p. 104, "Manufacturer Info"