Scyllion (Earth-5875)

Scyllion was the capital of the human Outer colony Charybdis IX. Having five thousand inhabitants, it consisted of a series of rugged and old facilities and a red sky. The Scyllion Warehouse District was one of the most famous sections of the city.

Early history
Scyllion was founded one year after the colonization of Charybdis IX, serving as a mining settlement, paying for mining corporations, which would in turn grant them stay and good living conditions in the city's buildings. However, the corporations became essentially monopolies, with prices raising dramatically and the cost of life exceeding what the companies paid their employees. Ultimately, the corporations competed for power within the colony.

Riots
The colony eventually saw the rising threat of the Insurrectionists during the Secession. In 2534, the Office of Naval Intelligence recommended the UNSC to implement martial law in the colony, but the UNSC was unable to do it with the outbreak of the First Contact War. While initially only overseeing the growing dissent, ONI took action once it was discovered the local Insurrectionists were using stolen Covenant weapons.

In 2535, ONI performed a joint operation with the UNSC Navy, becoming one of then-Lieutenant Jacob Keyes' first missions. The Insurrectionists were able to discover the location of the ONI command center and went to attack it with heavy weapons. Keyes and all surviving ONI agents escaped from the building to be evacuated by ODST support.

Battle of Charybdis IX
Hours after the riots, the surviving UNSC personnel were transported to the UNSC Midsummer Night, only for the Covenant Fleet of Sacred Consecration to arrive in the Charybdis system and start attacking the colony, which they discovered after tracking down information from the Covenant weapons used by the human Insurrectionists. The Night was able to flee from the system while the local defense fleet engaged the Covenant forces. The fleet's Punic-class supercarrier was disabled and boarded by Zealot Thel 'Vadamee during the battle.

Charybdis IX was then glassed and rendered lifeless by the Covenant, prompting the UNSC to abandon the planet and the city.