Halo

The Halo (A.K.A the Fortress Worlds by the Forerunners) is a colossal ring-shaped object constructed by the Forerunners themselves, in which is used as a huge and advanced research facility, galactic sterilization and can serve as many roles and used for conservation of biodiversity.

•**FEATURES**

The Halos today have a diameter of about 10,000kms — this size is roughly similar to Earth's, which is 12,756kms in diameter. While the original Halos have a diameter of about 30,000kms. The surface of each ring is about 318kms wide, with a depth of 22.3kms to 47kms.

The overall circumference of the ring is 31,415 km and the interior surface area is 9,985,200 km2 - roughly the size of Canada. The main structure of the ring is constructed of a superdense foundational material, with elaborate scaffolding and cantilever structures laid over it to support the artificial landmasses and the myriad tunnel networks and caverns that riddle the installation's internal structure. Many of these tunnels are transit conduits meant for use by the ring's Sentinels. The Halo rings achieve their "gravity" through artificial gravity generators - despite their shape, the ring does not need to spin to create its gravitational pull, though they do spin for other reasons unrelated to gravity generation.

The Halos are capable of repairing themselves to some degree, replacing damaged plates of foundation material and restoring biological sections. Plus they can repair themselves via Sentinels.

•**ENVIRONMENT**

Although first and foremost designed as weapons of mass destruction, the Halos are also designed as habitats for transplanted lifeforms, including but not limited to humans. The Halo installations support a wide range of environments, habitats, ecosystems, and climates. These halo installations supported warm, temperate forests that were both deciduous and coniferous, swamps, and cold, snow covered tundra environments + the rings support bodies of water, lakes, rivers, oceans, waterfalls and etc etc with the beauty of the ring's environment clearly identical to Earth's nature. And also supports an oxygen-nitrogen atmosphere plus it has vegetation, marine and terrestrial lifeforms thriving on the rings.

•**FACILITIES**

Each Halo has several assets that are uniform to all installations. Each contains a control room located somewhere upon its inner surface. The control room houses the installation's mainframe, known as the Core, from which all of the Halo's systems can be operated. The Halo's main weapon can be activated inserting the Activation Index into the Core; on the other hand, the Core may also be used to disable the main weapon. Each Halo also possesses a Library, a large structure protected by an energy shield and a massive wall, where the Index is housed and protected by Sentinels. The index itself is a semisolid holographic representation of the data needed to activate the ring.

Installations also possess Cartographer facilities, which contain the complete, real-time record and schematic of the installation, including its inner passages and networks, to be used as a navigational reference for traversing the installation.

**•NOT-MENTIONED THINGS**

Each halo installation contain advanced teleportation grids, allowing instantaneous transportation for a Monitor or Human to any place on the installation. The Halo installations are also equipped with drive engines spaced along their rim. In the event of an emergency, a Halo can maneuver itself to avoid damage from a collision or weaponry. While ideally moved through fixed portals, the rings are able to perform slipspace jumps under their own power, a failsafe measure implemented in the event of capture by hostile forces would transition the Halo into slipspace and place it on a collision course with a planet or other celestial body, ensuring the weapon's destruction rather than allowing it to fall in the wrong hands.

The Halos hence they have drive engines, they can move themselves into any location and perform maneuvers plus they can open portals to locations or warp, each Halo have a defense system capable of annihilating absolutely anything in nanoseconds and can be raised by the Installation's monitor. It also has energy shields.

The Halo rings also has a primary weapon capable of wiping out any lifeform within a three-dimensional radius of 25,000 light years. While it also has a secondary weapon capable of manipulating gravity, therefore it can rip apart planets, moons, asteroids and etc and/or destroy it.

•**CUSTODIAL**

The installations are designed to be run by advanced and fully sentient artificial intelligence constructs specially assigned by the Forerunners. The highest intelligence on each installation is a single monitor. The monitor's task is to ensure that the installation's Sentinels, which range from Constructors to Aggressors and Enforcers, repair, maintain, and defend the ring from damage, etc etc and ensure that their own installation is ready to fire on demand, including running activation simulations. Monitors also have access to their respective installation's defensive system. Monitors are also permitted to make alterations to the Halo ring.

Save for the monitor, all automatons can be constructed at specialized production facilities that float high in the Halo's atmosphere. They seem to have access to copious amounts of materials for constructing an almost indefinite number of automations.