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Swazdo-lah, Tenno! Welcome to Cetus, unique among the stars! Explore the bustling market for all your practical needs! If you're looking for adventure on the Plains of Eidolon speak to Konzu. Stay a while, and come back anytime on your journeys across the Rails.
—Introductory Description
While their floating markets may ply the rails of the Origin system, Cetus is the Ostron home: a trading hub where travelers from across the system meet to exchange information, wares and plunder in safety, protected by the Unum-enforced laws of barter and parley - free from the influence of Grineer and Corpus.
—Cetus Fragment

Cetus is a village built by the Ostrons, located to the north of Mantle, Earth. A humble settlement, located in the south region of the Plains of Eidolon, they are guided by a secretive order named The Quills, loyal to the ever-mysterious Unum, who constantly watches over the plains keeping her people safe from Grineer aggression.

As a city hub, players can interact with various NPCs to purchase items from shops, or accept quests or bounties to be completed out in the plains. Players can enter the plains via a large Orokin door on the town's outer wall, leading to a large room that has another door that leads to the plains beyond. The room acts as a loading screen, and players will be unable to exit out the other end until the loading is complete.


Main article: Ostron

The Ostrons are the inhabitants of the Cetus settlement near the Plains of Eidolon on Earth. They are a hardy, mercantile people that dwell in the shadow of the Orokin Tower of the Unum, which they harvest for their livelihood. Kept safe from Grineer aggression by the arcane powers of the Unum herself, Cetus serves as their central trading hub in the Origin System and a refuge for all others who come to it with peaceful intentions.

The Quills[]

Main article: The Quills

The Quills are a mysterious monastic order that serve the equally enigmatic Unum, a being who resides within the Orokin Tower at Cetus in the Plains of Eidolon. They have very close ties to the Ostron people who also praise the Unum, and are seemingly knowledgeable about the secrets of the Tenno. They are said to be able to divine the future, which combined with their information gathering prowess allows them to preemptively end threats to Cetus through their operatives.

Plains of Eidolon[]

Main article: Plains of Eidolon

The Plains of Eidolon is an expansive, open Landscape connected to Cetus, an Ostron settlement located on Earth. In the shadow of the Orokin Tower of the Unum lies an ancient battlefield, where an enormous Sentient was defeated during the Old War by GaraIcon272.png Gara. The Grineer have set up numerous outposts and bases to study and mine the ruins in the area, observing and patrolling the plains for any threat to their operations.


  • In the eastern part of city outskirts hides an Easter Egg in the form of the Digital Extremes logo, easily recognizable by its emblem. Activating it will show the credits roster for the Plains of Eidolon.
    • In the roster is Hayden Tenno, the main protagonist in Digital Extremes' previous game Dark Sector.
  • Cetus is the Latinized form of κῆτος (ketos), the Ancient Greek word for "sea monster" or "huge fish", but in recent times, the word is associated with whales (i.e. cetaceans). Cetus can also refer to a constellation of the same name.
    • Interestingly, one of the stars in the Cetus constellation is Tau Ceti, one of the closest stars to the Sun and is most likely the "Tau" system the Sentients were originally sent to colonize.
      • Tau Ceti has, as of 2021, 4 confirmed planets, 4 unconfirmed planets, and 1 confirmed debris belt. Tau Ceti e, the third confirmed planet, has an orbit with a radius about half that of Earth's, and Tau Ceti f (the fourth one) has an orbit nearly a third larger than Earth's. These harsh environments, coupled with the outer debris belt, create both the need and the resources to possibly terraform a planet or two for Human colonization.
    • The people of Cetus harvest Unum's flesh in a manner similar to how whalers harvest a caught whale. 
    • Eidolons vocalize using the calls of humpback whales, as seen in Devstream 102.[1]
  • Cetus appears to be located at the top or near the Caspian Sea.
  • Cetus appears to be next to modern-day Astrakhan, which may have inspired the name of the settlers there, the Ostrons.



Patch History[]

Hotfix 31.5.8 (2022-05-11)

  • Fixed the Day/Night time countdown in the Plains of Eidolon/Cetus being paused indefinitely at "In 0 s".

Update 31.1 (2022-02-09)

  • Fixed a vehicle in Cetus having no collision.

Hotfix 31.0.2 (2021-12-16)

  • Fixed a crash related to returning to Cetus after a Quest mission in the Plains.

Update 30.7 (2021-09-08)

  • Fixed a script error related to being the Operator in the Cetus tunnel.
  • Fixed an issue where the floor in Cetus would disappear when viewed from a large distance.
  • Fixed an issue where Affinity was not retained after completing a mission in the Plains of Eidolon, returning to Cetus, and then going on a mission again.
  • Fixed the “Speak to Konzu” objective text when first entering Cetus not being capitalized.

Hotfix 30.2.1 (2021-05-13)

  • Fixed cases of Quill Onkko's cave door sometimes not opening after accessing Cetus from the Plains (and potentially other cases of doors not opening).

Hotfix 30.0.6 (2021-04-20)

  • Fixed Eidolon spawn sound continuing to play if entering Cetus while spawn / despawn is happening.

Update 29.10 (2021-03-19)

  • Added a grid backdrop to offerings at the vendors in Cetus to differentiate if their requirements are met.
  • Fixed Warframes blocking the view when speaking to vendors in Cetus.
  • Fixed a couple of context actions appearing inside of environment objects, notably Fisher Hai-Luk in Cetus.
  • Fixed Nightwave challenges that require you to go back to Cetus missing UI popups and transmissions while transitioning between open zone and hub.

Update 29.9 (2021-02-23)

  • Fixed a crash that could occur when transitioning from Cetus to the Plains.

Hotfix 29.6.8 (2021-01-25)

  • Fixed another case of Terlyast spawn sound persisting when returning to Plains of eidolon from Cetus after spawn has started.

Hotfix 29.6.6 (2021-01-12)

  • Fixed another case of Teralyst spawn sound being audible in Cetus.

Hotfix 29.6.5 (2021-01-09)

  • The Teralyst spawn sound loop will no longer play while in Cetus.

Hotfix 29.5.2 (2020-11-20)

  • Audio Mix tweaks have been added for Cetus!

Update 29.5 (2020-11-19)

  • Vome/Fass time indicators now appear when viewing the map inside the Necralisk hub!
    • Cetus and Fortuna have been given the same treatment.
  • Changed all vendors’ names in Fortuna and Cetus from ALL CAPS to Title Case.
  • Updated decals on the huts in Cetus to use modulate blending so that they blend in better.
  • Fixed missing motion blur on Ostrons in Cetus.

Hotfix 29.2.3 (2020-10-08)

  • Fixed inability to matchmake together when loading from a Town to a Free Roam mission.

Update 29.2 (2020-09-29)

  • Fixed Warframes overlapping the Modding UI when Modding in a Town.
  • Fixed camera alignment issues when opening the Arsenal as the Operator in a Town.

Update 29.1 (2020-09-17)

  • Fixed possible spot-loading when going into a Town.
  • Fixed a script error related to having Hildryn’s Balefire active while transitioning from Free Roam to Hub/Town.

Hotfix (2020-09-10)

  • Fixes towards failing to match-make while in a Town/Hub.

Hotfix 29.0.8 (2020-09-10)

  • Fixed parts of the HUD breaking after attempting to open the ESC menu during a ‘Mission Complete’ animation (going from Free Roam to Town/Hub). As reported here!

Hotfix 29.0.7 (2020-09-03)

  • Fixed numerous bugs that could occur after a Host migration, including starting on a Free Roam mission, Host-migrating, returning to Town/Hub, and then returning to the Free Roam landscape.
  • Fixed Client Necramech’s not retaining their gained XP if you left the Necramech before you entered the gate/area to return to Town.

Hotfix 29.0.6 (2020-09-01)

  • Optimized Town server-code.
  • Fixed Necramech’s not retaining their gained XP if you left the Necramech before you entered the gate/area to return to Town.

Hotfix 29.0.4 (2020-08-27)

  • Fixed ghost channel members lingering behind in Towns causing confusion and server-strain.

Hotfix 29.0.3 (2020-08-26)

  • Fixed script error that can occur when trying to use the Scanner when returning to a Town.

Hotfix 29.0.2 (2020-08-26)

  • Fixes towards Town server stability and performance.
  • Fixed cases of the Town Chat channel not disappearing upon leaving said Town.

Update 29.0 (2020-08-25)

  • When returning from a Free Roam location to the respective Town (Plains -> Cetus, etc), the End of Mission screen will no longer stop player movement until after the initial animation ends.

Update 28.0 (2020-06-11)

  • Updated trade windows at merchants in Cetus to use the latest inventory UI.

Update 27.4 (2020-05-01)

  • Optimized load-times and memory footprint for Towns.
  • Fixed multiple issues with Cetus’ skybox related to fog, ambient clouds, and the weather systems.

Hotfix 27.3.13 (2020-04-14)

  • Optimized network connections to Towns for people around the world. Not only will this improve player movement but it should also help accelerate Kill Code transmission for Scarlet Spear Murex Raids that would have previously had a very high-ping to our servers.
  • Fixed a script error when quitting Warframe while in Cetus.

Hotfix 27.3.12 (2020-04-14)

  • Optimized network connectivity for Towns.

Hotfix 27.3.8 (2020-04-02)

  • Fixed a script error when transitioning from Plains to Cetus with the Synthesis Scanner equipped.

Hotfix 27.3.3 (2020-03-25)

  • Fixed several types of crashes that could occur when travelling to or from Towns.

Update 27.1 (2020-02-04)

  • Fixed being able to see outside the level from the gate in Cetus.
  • Fixed Fast Traveling to Fisher Hai-luk teleporting the player midair.

Update 25.7 (2019-08-29)

  • Fixed players watching two Warframes attempt a handshake in Cetus not actually seeing it happen. Truly the most secret of handshakes!

Update 25.5 (2019-07-31)

  • Fixed metallic looking eye textures, predominantly seen in Cetus at night.

Update 23.10 (2018-10-12)

  • Added objective marker pointing players to Konzu when entering Cetus for the first time.
  • Added more Corpus and Fortuna NPCs (undocumented).

Update 22.0 (2017-10-12)

  • Introduced.