UNSC Pillar of Autumn

Pillar of Autumn redirects here. For more articles of the same name, see Pillar of Autumn (disambiguation).

Thel 'Vadamee: "There was only one ship."

Prophet of Truth: "One? Are you sure?"

Thel 'Vadamee: "Yes. They called it the Pillar of Autumn."

— Conversation between 'Vadamee and the High Prophet of Truth.

UNSC Pillar of Autumn, (hull classification symbol C-709), was a Halcyon-class light cruiser in the UNSC Navy. It was informally referred to as the Autumn, and, in some cases, the Pillar. It was the sister ship of UNSC Dawn Under Heaven and UNSC Toulouse.

Prior to the Fall of Reach Pillar of Autumn was selected to support Operation: RED FLAG, a SPARTAN-II mission to capture Covenant leaders. Captain Jacob Keyes was placed in command. The operation was forestalled by the Covenant assault on Reach; the cruiser carried some of the few UNSC survivors and fled the system having lost most of its intended SPARTAN-II passengers.

The cruiser was guided to the Soell system by the smart AI Cortana. There it was engaged by a Covenant fleet guarding Installation 04. Keyes crash-landed the ship on the installation where the surviving crew continued the battle against the Covenant, and later, the Flood. The ship's sole remaining combat-effective SPARTAN-II, John-117, was forced to destabilize the Autumn's fusion reactor, destroying both the ship and the ringworld, to prevent the Installation from being fired.

History

Human-Covenant War

UNSC Pillar of Autumn was constructed at the Reyes-McLees Shipyards on Mars. The ship began construction in 2507,, was completed in 2509, and was launched on December 1, 2510.

During the Battle for Arcadia in February 2531, Pillar of Autumn engaged two CCS-class battlecruisers alongside UNSC Belfast, UNSC Texas and UNSC Armstrong. Along with the other three ships, Pillar of Autumn destroyed the battlecruiser designated CCS-U321 after catching it with its shields down, but the battlecruiser designated CCS-U624 was able to make it to the surface of Arcadia. In the battle between the UNSC and Covenant forces, Pillar of Autumn was badly damaged along with Armstrong while Texas and Belfast were destroyed. Upon the arrival of the UNSC Spirit of Fire, the smart AI Serina reported on these events to Captain James Cutter. Later in the battle, at the request of Spirit of Fire, Pillar of Autumn contributed several M145D Rhinos to the ground battle, enabling Spirit of Fire's forces to take down a Covenant energy shield.

The cruiser was decommissioned with the remaining Halcyon-class light cruisers, but was reactivated as the war worsened. Pillar of Autumn was pulled from long-term storage and was refitted in 2550 to serve as an emergency support ship in a conflict near Zeta Doradus.

A chariot for Spartans

By 2552, it was obvious to the UNSC that the war could not be ended with conventional military action. A desperate plan, known as Operation: RED FLAG was conceived to end the war by capturing Covenant leaders and forcing the enemy to the negotiating table. A colony world would be sacrificed to the Covenant to allow SPARTAN-II commandos to board and disable a Covenant ship, locate the Covenant homeworld, and abduct the targets. Pillar of Autumn was selected on August 25 by the AI Cortana to disable an enemy ship and deliver the Spartans aboard; the ship was selected for the Halcyon-class's durability, despite its class's usual lack-luster offensive capabilities. Command of the ship was given to Captain Jacob Keyes.

The cruiser received another refit designed by Senior Engineer Adam Crokett for the new mission, including a state-of-the-art fusion power plant and improved weaponry. Furthermore the command bridge was upgraded with a Tier III datacore to house Cortana and the drop pod bays were significantly expanded. After the refit, Cortana was transferred to handle the shakedown.

Fall of Reach

Main article: Fall of Reach

Pillar of Autumn pushes through the Covenant blockade and escapes Reach.

Pillar of Autumn was prepared to deploy on August 30. However, before it could depart the Epsilon Eridani system it was recalled to Reach; the UNSC fleet was mustering in preparation for an imminent Covenant attack on the planet. However, Cortana remained in control as the ship's normally assigned AI was not yet operational.

It was hoped an opportunity to capture an enemy ship would present itself, however the course of the battle forced the Spartans to deploy on other missions. Blue Team went to Reach's Gamma Station to enforce the Cole Protocol, while Red Team went planetside to reinforce the orbital defense generators. While the cruiser performed well, the battle was lost as the orbital defense platforms fell silent. There was only time to recover the remnants of Blue Team (John-117 and the clinically dead Linda-058) and a Marine fireteam led by Avery Johnson that was also onboard Gamma Station, before the ship was forced to flee the system.

During the battle over Reach, Pillar of Autumn attacked and destroyed a Covenant "sniper ship" in single combat. This prototype vessel was responsible for the destruction of many powerful UNSC warships. The unlikely victory of the Autumn, for a brief moment, left her as one of the most successful and resilient ships in the Navy. However, the ship was heavily damaged in the fight and its main reactor was rendered inoperable.

At some point during the conflict, Pillar of Autumn returned to drydock at the Aszod ship-breaking facility to rescue any survivors on the planet and retrieve a package. Shortly before the ship fled the system, the remnants of NOBLE Team were tasked with delivering a fragment of Cortana's data chip to the Autumn. The ship left drydock immediately afterward. It was nearly destroyed by a Covenant battlecruiser before it could take off, but the Covenant ship was destroyed by SPARTAN-B312 with an Onager mass driver.

Pillar of Autumn prior to making a slipspace jump.

Pillar of Autumn was supposed to have made a random Slipspace jump in accordance with the Cole Protocol. However, Cortana surreptitiously guided the ship to the Soell system and, ultimately, to Installation 04 instead. The AI used coordinates obtained from two Forerunner artifacts: one on Sigma Octanus IV, and one underneath Reach. The Covenant pursued along the cruiser's exit vector and arrived at Soell first with a battle group of CCS-class battlecruisers.

Battle of Installation 04

Pillar of Autumn approaches Halo Installation 04.

Main article: Battle of Installation 04

Pillar of Autumn was almost immediately engaged upon arriving at Threshold. The Prophet of Stewardship, who feared stray plasma torpedo fire might damage the holy artifact, ordered the boarding and capture of the cruiser. Fleet Master Thel 'Vadamee ignored this order and returned fire aggressively. Even so, the Autumn was able to destroy four ships and damage Truth and Reconciliation before boarders disabled its Magnetic Accelerator Cannon with an antimatter charge.

Captain Keyes ordered the crew to abandon ship. John-117 was given Cortana for safekeeping, and ordered to keep the AI out of enemy hands. The crew left the ship for the ring in whatever craft were available and the cryo pods were jettisoned. Keyes directed Pillar of Autumn on a course to crash land on the ring. The Covenant finally began hitting the ship with plasma torpedoes, but the cruiser survived the landing reasonably intact, though damaged beyond repair. The survivors transferred supplies from the ship to Alpha Base.

The Autumn's final resting place, shortly before its destruction.

The release of the Flood added an unexpected dimension to the battle. Monitor 343 Guilty Spark was preparing to fire the Installation in response to the outbreak; in conjunction with the entire Halo Array this would wipe out all sentient life in the galaxy. John-117 and Cortana returned to Pillar of Autumn to destroy the ring by detonating the still-functioning fusion reactors. An attempt to activate the cruiser's self-destruct from the bridge failed due to 343 Guilty Spark's interference. The Spartan was forced to manually destabilize the reactors with tactical ordnance.

John-117 and Cortana escaped the subsequent detonation and the ring aboard a Longsword fighter still docked in Launch Bay 7. Pillar of Autumn exploded moments after their escape, blowing up a segment of the ring causing the entire Halo to fall apart; ultimately destroying Installation 04.

Legacy

Installation 04 breaks apart as a result of the Autumn's detonation.

The Autumn-class heavy cruiser, which entered service as the replacement for the Marathon-class after the Covenant War, was partially designed after the refitted Pillar of Autumn. Due to the instrumental role the Autumn played in the war, the lead ship of the new class was named UNSC Pillar of Autumn II in honor of the original.

A segment of the ring that was blown off from the destruction of the Autumn became the location of an ONI investigation 6 years later. ONI forces engaged Thanolekgolo on the remnants of the ring.

Specifications

File:HW PoACS.png

A cross-sectioned view of the Pillar of Autumn.

Pillar of Autumn was roughly 43 years old at the time of its escape from Reach and later destruction on Installation 04. It was a cruiser of the Halcyon-class, the smallest cruisers in the UNSC Fleet.

The internal superstructure of Pillar of Autumn was designed by Doctor Robert McLees, though it was deemed unnecessarily over-massed and costly due to a series of cross-bracings and interstitial honeycombs. This led to the design being dropped from future models of Halcyon-class ships. Pillar of Autumn and 10 others out of 50 were built with this type of superstructure. The internal bracing structure allowed the ship to function even after sustaining critical levels of damage. Furthermore the ship was fitted with an intraship transit system, which consisted of a network of lifts, stairs and mag-rail platforms. This allowed personnel to quickly travel through the ship.

Power plant

The refitted Pillar of Autumn.

Prior to being refit for the Spartan mission, Pillar of Autumn was equipped with Mark II Hanley-Messer deuterium fusion engines, which supplied only 10% the power of the standard 2552 UNSC Navy reactor. Pillar of Autumn was refitted with a set of improved nuclear fusion engines that featured two smaller reactors around a larger one, which were capable of boosting the overall power output by 300% for a short time if needed.

Fusion reactors generate extreme heat which must be removed in order for them to remain active without overheating. The Autumn's overhauled reactors were an especially severe case of this. Usually, the excess heat was conducted to a chemical agent which would then vent into space. However, the Autumn's upgraded specifications also included an upgraded cooling system, which featured a "laser-induced optical slurry of ions chilled to near-absolute zero", which was far more efficient than the typical method and removed the reliance on expendable chemical temperature-control substances. In essence, the amount of excess heat removed by the new system increased as the reactors' output did. This self-regulating and self-cooling power plant was critical in combat since it virtually eliminated a commander's concerns about overheating and slagging a ship's engines.

Pillar of Autumn's reactors were able to be overloaded by explosives, either grenades or rockets, destroying the vulnerable vent cores. Once these were destroyed, the reactors began to go critical, resulting in temperatures of over 100,000,000 degrees and a thermonuclear explosion large enough to tear apart a Halo installation.

Armament

Prior to being refit for the Spartan mission, Pillar of Autumn had just one regular MAC gun and six Archer missile pods. The upgraded Pillar of Autumn received extensive refits, including several to its weapons systems. Eventually, it was host to a very powerful armament; far in excess of the original Halcyon-class ships.

• With extra power capacitors and power recycling systems, Pillar of Autumn's MAC gun could fire three consecutive shots per charge.
• The Mark II, Light Coil - 56A2D4/MAC gun fired lighter projectiles compared to most ship grade MACs, but these rounds worked much like shredder rounds. Each charge was able to fire 3 rounds.
• Thirty-Two M58 Archer missile pods.
• Four Shiva-class nuclear missiles, one loaded onto a remote-controlled Longsword interceptor, and three ship-launched.
• Eighteen M910 point defense guns with overlapping fields of fire for point defense against single ships. Two of these cannons were later salvaged by the surviving UNSC personnel for Alpha Base.
• Eight Mark 33 Spitfire naval coilgun batteries.
• Six M66 Sentry autocannon turrets.

Engine room

Main article: Fusion drive

Pillar of Autumn's engine room was a large, three-deck high chamber allowing access to the fusion engine core. Side passages allowed for movement from the bottom deck all the way up to the catwalks on the third. The manifolds into the cores were suspended above the second deck. Controls on the third retracted these manifolds, exposing a vent that led directly into the core. It was using this method to expose the core via the vents that the John-117 ultimately destroyed the ship and Installation 04. This room is the largest room in Pillar of Autumn with the exception of the hangar bay and the "leap of faith" room.

Airlocks

Airlock 31, 32: Lifeboats destroyed by the Covenant to make way for boarding craft.

Airlock 51: Lifeboat destroyed as it departed from the airlock.

Airlock 52, 53, 61, 62, 63: Lifeboats escaped from the vessel.

Units

• 830 Marines-1 ODST Battalion, 1 Marine Battalion (79th Infantry)
• Combat Team Alpha
• Combat Team November
• Combat Team Sierra
• Combat Team Victor
• Fire Team Charlie
• Fireteam Raven
• Fire Team Zulu
• First Platoon
• Fifth Platoon
• Fourteenth Platoon
• Second Platoon
• Twenty-Second Tactical

Trivia

Behind the scenes

• When designing the ship, Lorraine McLees took inspiration from the MA5B assault rifle and from images of Mobile Suit Gundam. She described the Autumn as being "essentially a big gun with engines".
• Pillar of Autumn was modeled by former Bungie employee Adam Crokett.

Miscellaneous

The Bulletin Board on the Autumn's bridge in both Halo Combat Evolved and Anniversary.

• In Halo: The Fall of Reach, the description of Pillar of Autumn is considerably different from its Halo: Combat Evolved incarnation. The bridge is described as having a command chair and a curved viewport; in Halo: Combat Evolved, this chair is absent and the window consists of several flat sections. The novel also describes the bridge as being extremely cramped, with only a meter of space between the command chair and the other stations, while in the game, the bridge is clearly more spacious. According to the novel, there is also an elevator leading directly from the engine room to the bridge. In the game, the engineering and the bridge are on the same level, and there are no doors which may belong to an elevator adjoining the bridge. In addition, the engine room is described as being "hexagonal", while in the game, it consists of two vaguely rectangular chambers with the engine core in the middle. The ship is also described as having rotating centrifuges to generate artificial gravity; no rotating sections are present in the game, unless they are located within the hull.
• Pillar of Autumn's was approximately 1.17 km long, a reference to John-117. The ship's length is exaggerated in the final level of Halo: Combat Evolved to a length of three kilometers, likely to add urgency and suspense to the escape sequence.
• In Halo: Combat Evolved, the ship's emblem is the Marathon logo. In Halo: Reach, the ship's emblem is retconned into the Seventh Column logo. In Halo: Combat Evolved Anniversary, the Seventh Column emblem is replaced by a similar-looking gear, since the Seventh Column is an affiliate of Bungie.
• The bulletin board just outside the bridge of the ship contains a number of amusing clips, some throwbacks to Marathon. These can be examined on the first level of Halo: Combat Evolved. The board has a flier for a missing cat called Jonesy. This is a reference to the Alien movies, where the cat's name was Jonesy. The board also has a flier telling Marines to 'Keep it Clean', a quote later used in Halo 3: ODST.
  • The re-textured bulletin board in Halo: Combat Evolved Anniversary includes a classic Internet gag image of a "cat found" poster mistaking an opossum for a cat, as well as a poster labelled "Dark Planetoid Rising", featuring the Forerunner planet Requiem as it appeared in the Legendary ending to Halo 3.
• During the brief cutscene in Halo 2 where Pillar of Autumn escapes, it is portrayed by a Marathon-class heavy cruiser, rather than a Halcyon-class light cruiser; this is because the Halcyon was not coded into the game for the sake of saving resources; this error is rectified in Halo 2: Anniversary.
• In its appearance in Halo: Reach, the ship went through many changes, including that the Marathon symbol is replaced by the Seventh Column symbol, and the bridge has been shrunken to a smaller scale.
• Pillar of Autumn is available as a prop for Xbox 360 Avatars.
• Pillar of Autumn plays a role in Halo: Combat Evolved, Halo Reach and Halo Wars. In the first two, the player has to deal with various objectives surrounding the ship and crew. In Halo Wars, Pillar of Autumn contributes to the Battle for Arcadia before the UNSC Spirit of Fire arrives and then provides the player with support during the battle in the form of experimental Rhinos.

Gallery

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  Profile view of Pillar of Autumn in Halo: Combat Evolved.

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  Pillar of Autumn approaching Installation 04.

• HCE-PillarOfAutumnAngle.png

  Another view of the Autumn near Installation 04.

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  Speculative internal schematic by Stephen Loftus of the Pillar of Autumn's honeycomb-like bracing structures.

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  The outline of Halo Combat Evolved's The Maw level.

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  A closer look of the outline of the final level.

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  The vending machines in the Cafeteria aboard the Autumn. Note that water is listed twice in "Drinks".

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  Cortana, the AI assigned to the Pillar of Autumn.

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  Pillar of Autumn in an asteroid field near Reach, moments before a Covenant ship exits Slipspace and attacks in Halo Legends: Origins.

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  Pillar of Autumn taking plasma impacts at the Battle of Installation 04.

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  The crashed Autumn in the desert of Alpha Halo, seen in the level The Maw.

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  Pillar of Autumn's fusion reactors go critical.

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  Pillar of Autumn's ship emblem as seen in Halo: Combat Evolved. In Halo: Reach, the emblem was replaced by the Seventh Column logo.

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  A piece of wreckage from the Pillar of Autumn floating in Installation 04's debris field in The Mona Lisa.

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  Concept art of Pillar of Autumn in Halo: Reach.

• PoAReachConcept.jpg

  Concept art of the Autumn taking off from the Aszod drydock in Halo: Reach.

• Reach 3889544 Full.jpg

  Pillar of Autumn dry-docked in Aszod.

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  Pillar of Autumn taking off from Reach during the Fall of Reach.

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  Right-side view of the Halcyon-class light cruiser Pillar of Autumn in Halo: Reach.

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  An angled view of Pillar of Autumn in Halo: Reach.

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  Hull-classification information on the Autumn's outer hull. The Seventh Column symbol is also visible.

• HMCC - Dear Diary achievement.jpg

  Concept art of the crashed Pillar of Autumn for Halo: Combat Evolved Anniversary.

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  Pillar of Autumn's bridge, as seen in Halo: Combat Evolved Anniversary.

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  Pillar of Autumn under attack.

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  A hologram of Pillar of Autumn on the Halo 5: Guardians multiplayer map Truth.

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  Pillar of Autumn in formation with an Epoch and several Paris-class frigates in Halo: Fleet Battles.

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  The Autumn, grounded on Installation 04 as the UNSC moves in to raid it.

Browse more images in this article's gallery page.

List of appearances

Halo: The Fall of Reach (First appearance) Adjunct (Mentioned only) Halo: Combat Evolved Halo: The Flood Halo: First Strike Halo 2 (Flashback) Halo Wars: Genesis Halo Wars Halo Legends Origins Odd One Out (Non-canon appearance)

Halo: Evolutions The Mona Lisa (motion comic only) Halo: Reach Halo: Fall of Reach Invasion Halo: Combat Evolved Anniversary Terminals Halo 4 (Mentioned only) Halo: Broken Circle (Indirect mention) Halo 2: Anniversary (Flashback) Halo: Fleet Battles

Halo 5: Guardians (Hologram) Halo Mythos Halo: Fireteam Raven