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HW2 Render Serina-FullBody.png
Biographical information

Activation site:


Began service:

January 7, 2530[1][2][3][4]

Ended service:

January 4, 2537[5] (aged 6)




Young woman with long brown hair



Political and military information


United Nations Space Command


UNSC Spirit of Fire AI construct

Service number:

SNA 1292-4[1][4]


"It was a pleasure and an honor to serve with you, sir. Do look after everyone for me, would you? Goodbye, Captain. Serina out."
— Serina's final report to Captain Cutter.[6]

Serina (AI Serial Number: SNA 1292-4)[1] was a third-generation[4][Note 1] "Smart" AI that was assigned to the UNSC Spirit of Fire, a modified Phoenix-class colony ship commissioned by the UNSC Navy.[7][8] Serina's avatar was a young woman with long hair and she spoke with a distinct British accent.



Serina was created by Daedalia Technology, a Martian firm, on January 7, 2530. Serina was considered their greatest work of that era, being an omni-capable AI that displayed both impressive intellectual capacity and remarkable computational efficiency.[2][3]

UNSC Spirit of Fire[edit]

Serina replaced the previous shipboard AI of the Spirit of Fire,[1] although she had a somewhat rocky period of acclimation to the ship's unorthodox crew.[2][3] During her service aboard the Spirit, Serina and Nurse Lulu Hershey started to have "girly" discussions together during the latter's night shifts in the ship's medical bay.[9]

During 2531, Serina was present in the final battles of the Harvest campaign as well as the Battle for Arcadia and the Battle of Trove, providing the crew with intelligence on the various situations they encountered. After the destruction of Trove, Serina, along with the rest of the crew of the Spirit, were left stranded far beyond human-controlled space without a Shaw-Fujikawa Translight Engine. While on Trove, Serina completed the first in-depth analysis of the Flood in UNSC history - though her findings were never able to make it back to Earth.[4]

On the next six years, Serina would focus her efforts on designing and modifying vehicles and weapons for the Spirit of Fire crew, including modification for the M808S Scorpion and the HRUNTING Mark III (S) Cyclops, alongside weaponizing cryotechnology for UNSC use based on research conducted by Ellen Anders. The results of Serina's experiments into cryoweaponry include the ZAV-48 Frostraven, the Tundra M88 Bison APC with a vacuum energy siphon, and the possibility of Hellbringers making use of cryoweapons.[2][3]

Rampancy and end of service[edit]

In 2537, six years after the events on Trove, Serina had begun to fall into the early stages of rampancy, but continued her essential functions on the Spirit. On January 1, Serina sought to conduct routine maintenance aboard the vessel, awakening several engineers from cryo-sleep. One of them, Violeta Maldini was then attacked by a Pod infector that had been nesting out of sight after the events on the Shield World, infecting her. Serina imposed lockdown on cryo chamber Foxtrot 7, and did not kill the parasite as the onset of her rampancy led her to be more interested in studying it, neglecting the possible danger it presented to the rest of the crew. She watched Maldini mutate into a carrier form, breeding new infection forms and utilizing Maldini's knowledge of cryo chamber codes to awaken more crew members to infect. Realizing her mistake as the Flood threatened to breach quarantine, Serina awoke Professor Ellen Anders (and, indirectly, Jerome-092) who managed to kill all Flood aboard the vessel, ensuring the survival of the Spirit and its remaining crew.[5]

After these events, the now rampant Serina began her final dispensation, set up by Anders,[5] on January 4, leaving one final status report for Captain Cutter upon his eventual awakening and was soon after completely terminated.[6] One of her final acts was quietly restarting production lines aboard the Spirit of Fire to replenish materiel that would later prove pivotal against the Banished.[4]

As part of the crew's hope to leave a trail, Serina created a series of preprogramed maintenance sheds and data drops. As per a promise she and Cutter made to John Forge, Serina included in these a message Forge had recorded for his daughter. The UNSC recovered at least one of these with the data falling into the hands of 343 Guilty Spark during his time with the UNSC. In 2557, Spark was able to explain to Rion her father's sacrifice and give her the message that Serina had kept her promise and left behind for Rion.[10]


Serina had a very sarcastic and detached nature. She frequently seemed to disregard the lives of others, even her own ship's crew - such as when the Spirit of Fire was slowly being pulled inside Trove - almost always responding to their peril with some curious remark or dark joke.[11][12] Although prone to sarcastic comments and exhibiting a seemingly uncaring attitude, she was more compassionate than she seemed. After Spirit of Fire undertook its mission to Trove, Serina - expecting not to make a return journey - fabricated fake Valentine's Day correspondences for the ship's crew using their prior emails as a basis. No one ever suspected her of this deception.[13]

Serina also had several fragments of memories from her donor. Several of these memories include food, the smell of flowers, the feeling of grass on her feet, and a lot of other little moments. Relating to this during her "free" time, she tried to remember what chocolate tastes like, with little success. She also ran detailed simulations based on the memory of when her donor kissed a boy.[9]

Serina had a notable aptitude for research and analysis, and was fascinated by the vacuum energy research conducted by Professor Ellen Anders. During Spirit of Fire's long tenure in deep space, Serina put this interest to work in researching its potential for cryogenic weaponry.[3]



Development images[edit]


List of appearances[edit]


  1. ^ The Halo Encyclopedia (2022 edition) calls Serina a third-generation Smart AI despite all previous sources identifying her as a second-generation Smart AI.


  1. ^ a b c d Halo: The Essential Visual Guide, page 170
  2. ^ a b c d Halo Waypoint, Canon Fodder - Stay Frosty (Retrieved on Jun 17, 2018) [archive]
  3. ^ a b c d e Halo Wars 2, Phoenix Logs: Serina
  4. ^ a b c d e Halo Encyclopedia (2022 edition), page 95
  5. ^ a b c Halo: Tales from Slipspace - Something Has Happened
  6. ^ a b Halo Wars 2, campaign level The Signal
  7. ^ Halo Wars: Genesis: "Spirit's 'smart' AI, Serina, can coordinate the simultaneous repair and refit of 12 ships of the line. We couldn't get along without her."
  8. ^ Official Halo Wars Community Site, Spirit of Fire (Retrieved on Mar 24, 2011) [local archive] [external archive]
  9. ^ a b Halo Wars: Official Strategy Guide - I kissed a boy once.
  10. ^ Halo: Renegades, chapter 51
  11. ^ Halo Wars, campaign level Scarab
  12. ^ Halo Wars, campaign level Cleansing
  13. ^ Halo Wars, Timeline Events: 14 February 2531
  14. ^ Halo Wars, campaign level credits
  15. ^ Halo Wars 2, campaign level credits
  16. ^ Halo: Reach, campaign level credits