Titan is a methane ocean moon, decorated by long-abandoned Golden Age structures such as New Pacific Arcology that are slowly sinking below the waves. It has recently become infested by a new Hive sect, and is being picked over by scavengers from the Fallen House of Dusk.
During the Golden Age, numerous great cities such as New Pacific Arcology were built on Titan and became the envy of the rest of the Solar System. These cities were intended to be entirely self-sustaining due to the inhospitable nature of Titan's surface. Settlements on Titan were known to trade with other nearby worlds, such as Hyperion. Scientists also flocked to Titan to escape the stifling influence of organizations like Clovis Bray and carry out independent research. The moon was never terraformed by the Traveler, although 97% of New Pacific Arcology's residents hoped it would be chosen soon.
Titan was one of the first places in the Solar System to detect the arrival of the Darkness, and consequently one of the first places to experience the Collapse. A deep-space probe launched by a team under Dr. Shanice Pell encountered an inexplicable anomaly before losing contact with New Pacific Arcology. Not long after, the anomaly was determined to be such a threat that the entire planet was evacuated. The evacuation may have caused the Darkness to bypass Titan, as none of its structures bear visible battle damage, only wear and tear from a lengthy period of neglect.
The moon's cities remained completely abandoned for centuries, slowly decaying and sinking into the methane ocean. Guardians such as Cayde-6 used Titan as a rest stop during journeys to and from the outermost reaches of the system. Shortly before the Red War, however, a new Hive sect colonized Titan's ruins. When a group of newly-Lightless Guardians under Commander Zavala fled to Titan, hoping to use it as a secret base from which to launch a counteroffensive against the Red Legion, they found New Pacific Arcology heavily infested and nearly gave up on their plan. Worse, Fallen from the House of Dusk had followed the Guardians from Earth, and began feuding with the Hive. Fortunately, thanks to the timely arrival of The Guardian, the support rigs outside the Arcology proper were sufficiently cleared to allow Guardians to secure the command center and City jumpships to refuel there.
Around the time of the Almighty's descent upon The Last City, the Pyramids themselves had finally reached the outer Solar System. After corrupting Pluto, Neptune, and Uranus, the Pyramids set their sights on Titan.
A month after the arrival of a Pyramid on Io, another Pyramid arrived on Titan, holding position outside of the New Pacific Arcology. It was the first of the newer Pyramids to start deploying Pyramid Scales on the Arcology, antagonizing the Hive and Fallen there.
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