The site of the final battle of the Unum's champion, Gara and the colossal Sentient that wished to claim the Tower's regenerative qualities for itself. Today the remains of the Sentient, diminished and confused, wander the Plains - seeking a cohesion the Ostrons hope it shall never find.
—Plains of Eidolon Fragment
Her defense was her final attack. The device detonated, and the Unum cried out as night lit as day. The battle - the terror - was ended. The Tower walls shook. The Sentient's body shuddered, wracked by a cacophonous energy. Forests fell as piece after piece, giant body after giant body crashed to the Plains and marshes and flatlands. Animals fled in spreading waves from pounding sky-high walls of dust, angered and whipped to fury by the death of a god.
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 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.
This open zone was introduced October 12th, 2017 in Update 22.0 and was remastered on April 4th, 2019 in Update 24.6.
The Plains of Eidolon has an area of about 5 square kilometers (2.25km x 2.25km), featuring various fields, hills, caves, and bodies of water in a mostly temperate climate. Unlike other mission nodes, the Plains of Eidolon is not procedurally generated using Tiles, but is instead a massive static map with unique features.
The Plains are accessible through two different mission nodes on the Star Chart, both nodes are on Earth. The first is the central hub of the Plains - Cetus, Earth - where the player will spawn on the shores outside of town. The second mission node will spawn the player directly in front of the gate that connects Cetus to the Plains. Both nodes will be unlocked directly after completing Vor's Prize and are not Mastery Rank locked.
Each server instance of Cetus can hold up to 50 players within the town, however, players can only exit onto the plains in the standard 2-4 man squads or Solo. Each map is considered its own separate mission instance, and will not be shared between squads.
Entering into the Plains from either Cetus or directly from the Star Chart will create a new mission instance of the Plains, with procedural generation applying to objects like resource spawn locations and mineral veins.
Progress on the plains is saved under the following conditions:
Upon returning to Cetus through the gates at any point, with the mission concluding and all progress saved.
On returning to the player's Orbiter via the escape menu.
All progress is automatically saved on completing Bounties.
Fishing, Mining, or using consumables results in a specific save of that content (fish caught, minerals extracted, consumables used).
Day & Night Cycle
Unlike with the Earth tileset's traditional day and night cycle which is set upon entering a mission, the Plains of Eidolon feature a real-time cycle which sees the map seamlessly transition from light to darkness. Daytime in the Plains lasts for 100 minutes, while nighttime lasts only 50 minutes. All players will experience the same time of day at any particular time in the Plains of Eidolon.
The time of day determines the type of enemies as well as the type of fish that players can encounter on the fields, and consequently affect the map's difficulty level. While the day cycle is more directed towards new players, the night cycle is reserved for more experienced players, with the more difficult enemies of the Sentient faction.
Occasionally, the Plains of Eidolon can experience rainy weather, ranging from soft drizzles to thunderstorms. During rainy periods, Grineer enemies in the Plains will experience reduced visibility, and Fish have a higher chance of spawning on bodies of water.
Other weather effects present in the Plains include varying strengths of wind, which can act on objects like trees, grass, and even Syandanas.
The Plains of Eidolon feature large bodies of water, which house a wide variety of aquatic life. Players can engage in spearfishing to catch various fish and crustaceans, which can then be used as resources to craft various Ostron items or gifted to Fisher Hai-Luk to increase standing with the Ostron faction.
Another means of getting resources in the plains is through mining; players can find mineral veins, visible as bright glowing marks, scattered throughout the landscape, which can then be mined with a dedicated cutting tool. Ores and Gems are used in a variety of crafting recipes, and uncut gems can also be traded in to Old Man Suumbaat to increase standing with the Ostron faction.
Hunting & Conservation
The Plains currently features three indigenous species of wildlife that roam around the field, the Kuaka, a small rodent-like creature, the Mergoo, a water bird strange in appearance, and the Condroc, a large bird-of-prey. These species can be hunted and killed to drop resources unique to said animals. Each animal has three variations of varying rarity. They can also be shot with a Tranq Rifle and collected to obtain tags and standing. Tags are used to purchase floofs, miniature stuffed animals, from Master Teasonai, who is in charge of Plains Conservation.
Bounties are randomly generated quests in which the player completes a series of short objectives from Konzu. Upon completion of a set of missions, the player will randomly receive a reward from the reward pool.
The Plains of Eidolon have several caves which players can enter, which can contain items of interest such as minerals or Codex objects. Many of these caves are small spaces that can have multiple openings that players can go through to access the cave.
Certain caves in the Plains however have closed Grineer doors inside of them, which act as the only entrance to the cave proper. The majority of these sealed-off caves can only be accessed upon the game creating a Bounty objective that takes place within said caves, at which point the door lights become green, indicating they can open. Unlike the smaller caves, these caves open up into massive, expansive caverns, and even lead into outdoor locations outside of the Plains' boundaries. Of these large caves, only the cave located by the geyser pond near Cetus can be accessed by players without the need to activate a Bounty.
Caves that have been discovered by players will be permanently marked on the minimap by a white jagged triangular symbol.
The Grineer, comprised of the special Tusk Corps, are the primary enemy faction in Plains of Eidolon during the daytime and can be found in either small patrol groups roaming the plains, or stationed at one of several outposts and firebases they have set up in the area. The Grineer firebases are heavily fortified with various defenses, including Ramparts and automated heavy defense turrets. For added firepower, these firebases are also capable of using mortars that lob high explosive shells at long range towards their targets. These Grineer units are unique as Eximus variants can possess the Venomous and Shock versions, normally only used by the Infested, Corpus and Grineer Archwing enemies respectively. They also use special Heat and Cold grenades not used by other Grineer units in the system.
The Grineer units can spawn at the Plains in different ways, either via Firbolg dropships or descending from orbital drop pods. They can also be deployed from Bolkor gunships, which are armed with rotary cannons for close air support. All the aircraft on the Plains are vulnerable to attacks and can be destroyed before they deploy the units they transport. If a sufficiently large patrol is engaged in combat, the Grineer units will deploy Tusk Seeker Drones that will signal for reinforcements, which then will proceed to spawn via the aforementioned options. The drones will continue to call in additional enemies unless they are destroyed.
The Grineer can also field airborne units such as Dargyn skiffs and Ogma bombers to patrol the plains and attack from the air. Once these air units are defeated, the ejected Dargyn Pilot may drop to the ground. The Dargyns can also be found parked near Grineer encampments and can be hijacked if the pilots are eliminated or beaten to the vehicles.
In addition to the air artillery, the Grinner have Tusk Thumper grounded mobile platforms. These quadrupedal tank-like units, in addition to cannon fire and automated turrets, are surprisingly agile for its size and uses its legs to jump and slam down or charge forward rapidly. It also uses its pneumatic ground pounder on its underside to create consecutive shockwaves. Its carapace is impervious to all forms of attack except for the weakspots on each of its legs.
During nighttime, the Grineer will retreat to the safety of their outposts, reducing the number of Grineer that can be encountered on the field during that period, though in turn raising the difficulty of a nocturnal assault on a base. Eidolon Lures will be deployed around the encampments, as the Grineer are hostile towards the Sentient and will attack if they encounter them, even the massive Teralysts.
During the Old War, a major battle against the Sentients took place on the Plains. The Sentient was defeated, scattering its fragments all over the area, resulting in the existence of the ghostly Spectral Sentients, also known as Eidolons. These are absent during the day cycle and show up only at night, increasing the difficulty of the Plains.
The main Sentient threats on the Plains during the nighttime are the Eidolon Teralysts, gigantic Sentient units equipped with powerful weapons and formidable defenses. Taking down a Teralyst is no small feat, requiring concentrated firepower from Operators and their Warframes. A full squad is recommended for this fight, though it is also possible - though extremely difficult - to defeat a Teralyst solo. Also roaming the plains at night are the smaller Eidolon Vomvalysts. Should a Vomvalyst be reduced to zero health it will shed its outer armor and turn into a glowing spectral form, complete with a fresh pool of health impervious to weapons fire but vulnerable to an Operator's Void powers. Eidolon Lures will absorb Vomvalyst sentients after the outer shell is destroyed, relieving the requirement of an Operator to destroy them.
Several Grineer outposts in the Plains house Ammo Dispenser units, visible as green containers with a white holographic display at the front and a floating green holographic bundle of ammunition on top. Interacting with these dispensers (default X ) will make them drop ammunition for all weapon types, which can then be collected by players. The dispensers have a 3:20 minute cooldown time, during which the dispenser cannot be used until its cooldown has elapsed. During this phase, the white display at the front will show the time remaining on the cooldown, and the holographic ammo bundle will change color from green to red.
Grineer outposts and bases in the area can have Armored Vaults on them, seen as large orange and green tracked carriages with control consoles on them. These Armored Vaults can be opened up to by interacting with the control console, giving a small amount of resources, and sometimes they will have a single Storage Container inside that can be broken for more drops. Armored Vaults are also used as the objective in Resource Theft Bounties.
Some Grineer outposts on the Plains have green communication towers with control consoles on them, which nearby Grineer can activate to call in reinforcements. Players can hack these towers to deactivate them, which will also deactivate any hostile turrets within the outpost. These towers could also occasionally be heard broadcasting Grineer propaganda from Councillor Vay Hek, as a prelude to Operation: Plague Star.
The Grineer encampment near the Hillside Ruin (marked as #3 on the map) in the Southeastern part of the Plains is host to an archaeological excavation setup that can be interacted with. Inside the circular command tent, a holographic map of the immediate area can be found. Activating the switch next to the map will highlight one of three possible locations with a glowing dot on the map, and will deploy an automated mining explosive (similar to a Dreg) from the tent to that location. When it reaches its target, the explosive drone will detonate, revealing fossilized Sentient wreckage and some random assorted resources or Credits.
Note that the explosive drone can be destroyed while it is docked inside the tent or as it travels towards its destination, and the system will become unusable if all the available drones are destroyed.
At night, bodies of water on the Plains will become energized with Sentient energy, which will inflict a Magnetic proc on any unit that touches it, temporarily reducing maximum shields and removing 100 Energy.
A small lake near the Twin Horns (west of the entrance to Cetus) has a small geyser at the center, which blows a powerful jet of steam upwards when units step on it, launching them upwards.
Thousand Year Fish statuettes are small, glass statues scattered throughout hidden locations in the Plains. These can be scanned into the Codex to give in-depth lore about Cetus and the Plains.
The Arsenal can be accessed from anywhere in Cetus via the Main Menu, then selecting Equipment → Arsenal. This allows switching of loadouts in Cetus without needing to return to the Orbiter.
The Mods segment can also be accessed through Equipment → Mods, allowing players to manage their Mods from Cetus.
The accessibility of the closed large Grineer caves on the Plains is determined upon the creation of a Bounty created within a particular map instance. Caves made accessible by Bounties will remain open even if the player fails any bounty phase before reaching them, however exiting the Plains will close said caves.
Judging by the location depicted in the Star Map, Cetus's specific location seems to be in Kazakhstan, somewhere off the northern coast of the Caspian Sea. Although it cannot be assumed nature would be the same given Warframe's timeframe, some of the Plains of Eidolon geography and biology, most notably its vegetation, seems to corroborate that inference.
In some of the Lakes scattered around the Plains, most notably the one with a small Grineer populated island in the middle of it, a player's warframe can become completely submerged in the water, and will be standing on the bottom of the lake. The camera, however, will be unable to pass through the surface of the water. This seems to only happen near the center of the lake, around the edges the correct events occur. Bullet jumping and other forms of movement still allow you to resurface.
The stream on the northwest corner of the Plains may be permanently magnetized, regardless of time of day.
If the player deploy their K-Drive in certain points of the Plains, they may fall out of the map, with no way to return to the surface other than leaving the Plains or, if in a squad, leaving it. Sometimes, write the comand /unstuck in chat can fix this bug.
Topographic map of the Plains of Eidolon. The grey spots represent rock outcroppings, while the black square represents Cetus.
Poe map (Grineer's camp & cave location)Go to PoE_Map
Plains of Eidolon at Night
Plains of Eidolon at Night
Plains of Eidolon at Night
Plains of Eidolon at Night
Plains of Eidolon at Night - Door to Cetus (Start/Finish)
Plains of Eidolon at Day
Plains of Eidolon at Day
Plains of Eidolon at Day
Plains of Eidolon at Day
Plains of Eidolon at Day - Door to Cetus (Start-Finish)
We’ve added a suite of improvements, including updated terrain textures, dynamic lighting, richly detailed trees and foliage, as well as a more nuanced day/night cycle. Plus, with all the technical improvements, the Plains runs smoother than ever!
You can now track and tranq animals in the Plains! Master Teasonai will be your source for Echo-Lures and Rarity Boosters as you track down, capture and get these animals to safety. Echo-Lures are not required as these animals continually roam the Plains, but calling them will bring them running (or flying!). A new Conservation Badge and Floofs from Master Teasonai await your efforts.
An avian of ridiculous appearance found along coastal regions and by large bodies of water. Mergoo circle and squawk at the sight of marine predators. Many an Ostron fisher owes their life to these odd little birds. Killing one is considered very bad luck.
New Kuaka and Condroc variants can also be found throughout the vast Plains of Eidolon!
Tusk Thumpers Inbound
Reports of a new Grineer machine have spread to Cetus. Vay Hek has deployed Tusk Thumpers -- mobile defense platforms that are just as efficient as they are deadly. Be prepared to encounter three menacing Thumpers of increasing size and difficulty: the Tusk Thumper, the Tusk Thumper Bull, and the Tusk Thumper Doma.
Without a vulnerability to use to your advantage, you’ll need to identify and expose their weak spots to take them down as quickly as possible. Take too long, and they’ll release reinforcement drones.
Make sure to visit Nakak and get your Tusk Thumper Floofs by trading in Resources! There’s one for each type of Thumper, collect them all!
The World Cycles displayed in the Navigation Window now display time until next Cycle/Temperature. The Plains of Eidolon time phases for Dawn, Sunrise, Morning, Day, Dusk, and Sunset are now all described as Day for clarity.
Bounties are now available out in the Plains of Eidolon! Certain tents placed throughout the Plains contain a console that encompasses the power to contact Konzu himself (when he’s not on his early lunch).
With Bounties now available out in the Plains, Incursions have been removed. These were meant to give players something optional to do as they spend their time in the Plains, but since Bounties can be activated on command, they no longer serve a purpose.
Ammo Stations in the Plains now only generate Ammo used by the weapon of the player who activated it. Also lowered the Ammo Station cooldown by half.
Changed the Archwing max height in The Plains of Eidolon to 100 meters (previous intentions were a max height of 50 meter).
Improvements to performance when streaming into the Plains of Eidolon.
Tweaked random encounter position selection to increase enemy activity in the Plains of Eidolon.
Made some aperture improvements to the Plains of Eidolon.
Polished and fixed various Plains of Eidolon objective UI.
Improved the way players perceive gun fire and explosion sounds at long distances in the Plains of Eidolon. The sounds are now more believable at long distances and give players a more accurate perception of enemy distance.
Increased the odds of Bounty objectives spawning in caves in the Plains of Eidolon.
Take your fight to the skies by hijacking unmanned Dargyns in the Plains. If you get caught, it's a footrace against the pilot to board the Dargyn! Use these to aid in your search for the new Eidolons!
THE GANTULYST AND THE HYDROLYST
“The Sentient was a deformed creature, sent from some dark fold of distant space, crushing towers and citadels across Earth...”
Until meeting its fate in a climactic battle.
“The device detonated. The Sentient's body shuddered, wracked by a cacophonous energy. Fragments of the Sentient crashed to the Plains and marshes and flatlands...”
These fragments are known as the Eidolons -- mysterious titans that continue to wander the Plains and loom over the people of Cetus.
Most of you have seen the Teralyst, a beast that rises from the watery depths every night. Legends speak of two more Eidolons that fell to the Plains, dormant for centuries but ever-present in the hearts and minds of the Ostrons.
Eidolon Hunters eager to prove their worth are trying to summon these creatures again. Are you worthy, Tenno?
Legends say the Gantulyst wields an enormous boulder for an arm and radiates powerful beams of Sentient energy. The Ostrons built a shrine in its honor hoping to gain its favor.
The Ostrons believe the Hydrolyst is an omen of impending natural disaster. Stories describe a distinct, pungent aroma that precedes the arrival of this toxic beast.
TERALYST MATCHMAKING BOUNTY
You now have options to matchmake for Eidolon Hunts!
Worth Noting: Remaining in the Plains for the entire Day Cycle effectively allows you to hunt the Eidolons across multiple nights. If your team kills all 3 Eidolons in one night, or across several, then the Teralyst will respawn and you can start the hunt again. TLDR players can hunt Eidolons across multiple nights without losing progress as long as they stay within their current session. Going back to Cetus resets it.
Added a teleport trigger to warp slow squadmates outside of the loading hallway and out into the Plains. This is to catch followers who were far enough away to warp to the player, past the blocking volume already set up in front of the gate.
The Plains of Eidolon now have changing weather patterns! This new dynamic weather system brings rain, lightning, rolling thunder, as well as fluctuating wind and cloud patterns. The Plains can shift from sunshine to rain (and vice versa) during the day and night, and rain will linger for a reasonable amount of time.
Jumping in puddles isn’t the only good thing about being out in the Plains during the rain! Take advantage of increased fish spawns and reduced visibility for the Grineer while it is raining.
Improvements towards the overall transition from the Plains to Cetus. This includes better handling of attempting to join a Host that was in the middle of transitioning to Cetus from the Plains, which sometimes resulted in either leaving the squad or loading into different Cetus instances.
Improved the pathing of the hijacked Drone in the Plains. This also fixes issues where the Drone would become stuck on it’s way to the Boil in Operation: Plague Star.
Fixed the End of Mission screen upon returning to Cetus from the Plains not showing Affinity gained on not fully Ranked weapons, Warframes, Companions, etc. This was leading to confusion on if you were losing that gained Affinity or if it was simply not displaying it.
Fixed not seeing any of your squadmate stats in the End of Mission screen when returning to Cetus from the Plains as the Host.
Fixed seeing no extraction marker in the Plains when a squad member transitions to Cetus.
Fixed the remaining Client post-Host migration joining the Client who left the squad instead of the new Host in the Plains.
Fixed losing all UI elements if you died in the tunnel upon returning to Cetus from the Plains and the End of Mission screen revived you.
Added more conventional Extraction mechanics to the Plains of Eidolon. We now start the extraction timer after 50% of a squad enters the Cetus gates. We added an area objective marker (the classic green indicator) and more direction to this area to notify squad members that extraction is waiting and counting down.
Removed the ability to be in Sky Archwing in certain Caves in the Plains.
You may now notice more populated Grineer bases in the Plains, as roving Grineer now retreat in pure panic back to base at night when the curfew siren sounds.
Fixed a loss of functionality when entering the Plains from Cetus and immediately trying to go back to Cetus.
Fixed a black screen and loss of functionality if you are holding a fish as you are forced to Extract with the 60 second countdown timer in the Plains.
Fixed the Cetus gates sometimes remaining opening while in the Plains.
Fixed wind sounds being too loud/not being affected by volume sliders in the expanded Caves in the Plains.
Fixed some terrain clipping issues and holes in the expanded Caves in the Plains.
Fixed Grineer drop pod sounds not playing for Clients in the Plains.
Certain Caves in the Plains can now be more indepthly explored (Operation: Plague Star will bring more gameplay to these expanded Caves). In a future Update, these Caves will be eligible for Bounty and Incursion missions!
Made a handful of performance Optimizations (mainly in the Plains). These performance fixes were largely discovered on the Console build, and graciously brought over to PC for an overall improvement on all platforms!
Upon aborting a mission in the Plains, you can now choose to either return to Cetus or your Orbiter.
Sky Archwing Enablers are no longer able to be spawned in the hallway between Cetus and the Plains.
Removed Lotus transmission from End of Mission screen when going from Plains back to Cetus when you haven't done anything.
Fixed experiencing a massive hitch as the Client when a Host migration occurs in the Plains.
Fixed being unable to invite players from the Friends list after aborting a mission in the Plains as a Client.
Fixed various Grineer machinery in the Plains not having sound.