|Recharge time||207 hours|
| Jump point
|Atmospheric pressure||Standard (Tainted)|
|Equatorial temperature||20°C (Temperate)|
|Highest native life||Fish|
A semi-habitable planet orbiting a red dwarf star a few jumps anti-spinward of Chainelane Isles, Mundo Nublar has a 16 Terran day long day/night cycle from being tidally locked toward a mid-size brown dwarf, that brown dwarf giving it the extra warmth required to make it viable for terrestrial life. The slightly ellipsoidal shaped world has extensive cloud cover and frequently suffers heavy storms, prompting its Blakist renaming, but also hampering efforts to undertake agriculture on the surface. 
During the Star League era the then-named EC3057-J83A played host to a SLDF naval weapons testing facility established in 2723, with research labs located on the surface of the planet as well as limited shipyards in orbit. Located far outside the range of House intelligence efforts, the facility served as the test-site for the development of weaponized Mass Drivers, the weapons reaching the operational stage aboard a refitted Kimagure-class WarShip by the 2750s. Due to the limited nature of the shipyard facilities and modest improvements upon existing naval weaponry, General Aleksandr Kerensky would order the facility shutdown and that its personnel relocate to the Gabriel facility in 2770 during the Amaris Coup.
The Word of Blake discovered the existence of EC3057-J83A while reviewing the SLDF archives at the Ruins of Gabriel, sending the Newgrange-class Erinyes yardship to investigate after the records strongly suggested that several half-disassembled WarShips had been abandoned there. Whether the Word recovered those WarShips is unknown, but by 3065 the Blakists were refitting the Erinyes with mass drivers. Disappointed with the effectiveness of these weapons, the Word would explore other "kinetic attack modes" at Mundo Nublar under the codename of Project Erinyes, ultimately resulting the asteroid bombardment techniques utilized by the Blakists at Taurus and Lopez. 
The weapon tests of these systems would be unleashed upon Mundo Nublar, with kilometer scale asteroids landing in the planet's oceans triggering massive powerful and sustained worldwide hurricanes, and large volumes of particulate matter being blown into the atmosphere after ground strikes. As the Jihad turned against the Word, the final weapons tests would be used to cover the Blakists' tracks, obliterating both the planetary and orbital facilities.
While vague rumors of the Blakists' use of a system called Mundo Nublar and Project Erinyes leaked out immediately prior to the Jihad, details as to possible location of the system did not emerge until the survivors of the Langford Wraiths mercenary unit reached Lyran Alliance space after a desperate escape from the Erinyes aboard an ancient Manatee-class DropShip. 
Interstellar Expeditions would learn of Mundo Nublar's location from the database at the Ruins of Gabriel after that facility was briefly captured by Chandrasekhar Kurita's taskforce in 3074. An IE scout mission reached the system in 3077 long after the Blakists had abandoned the system, the debris of the orbital facilities sufficiently intact to provide the organization with sizable details as to the system's past operations.
- Interstellar Players 3: Interstellar Expeditions, pp. 24-25 "Hunting the Word - Other Blakist Bases - Mundo Nublar"
- Field Manua: Updates, p. 200 "The Periphery - Deep Periphery"
- Jihad Hot Spots: 3070 p. 115 "Late 3070: The Time of Trials - Intel Brief: Mundo Nublar"
- Blake Ascending p. 275 "Late 3070: The Time of Trials - Intel Brief: Mundo Nublar"