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* Unmodded Tenno/Orokin weapons provides balanced stats against everything, which destroy Grineer and Infested alike. [[GameplayAndStoryIntegration The Corpus know this from studying Orokin technology]], and possibly from Tenno being sent to fight early Corpus in the distant past. And so they came up with their counter : lots and lots of energy shields. No wonder Ospreys are so annoying.
* Early-tier Grineer weapons tend to be effective against Corpus: they were fighting them for years before you showed up.
* High-tier or clan tech Tenno weapons usually focus on slash damage which is strong against Infested, just like how the Orokin intended them to be used.
* On the whole, the ugly Grineer weapons compare very favorably to the sleek Corpus weapons. Why? Because Corpus are a megacorp and so their weapons are designed by marketing execs for ''sale''. The Grineer are soldiers, and so their weapons are designed by soldiers for ''combat.''
* Excalibur's Radial Blind. In Arthurian Legend, the first time Arthur's reign is challenged, he drew Excalibur and it blinded his enemies, sound familiar?
* Magnetic damage is amazingly effective against Corpus. But then, the Corpus are a faction that consists heavily of robotic and mechanized forces. And we all know what ''magnets'' do to computers.
** And in regards to the other secondary elemental types;
*** Viral; Very effective against the Grineer, tends to fall short on killing anyone else. The Grineer are malformed, cybernetic reliant tube-born soldiers who canít survive outside their suits. Their immune systems likely canít take any viral/bacterial infections to save their lives.
*** Gas; Highly effective at cutting down the Infested, but not much else. Not only do most of the enemies in the game wear helmets that probably have filters, but the Infested are primarily made up from fungal growths and vaguely plant-like structures. Indiscriminate usage of chemicals sprays and attacks in real life usually results in the death of plant life around the area of affect.
*** Radiation; Inflicts confusion. At first glance it sounds like they just needed SOMETHING to stick Confuse onto, but real life acute radiation syndrome lists numerous neurological disorders among its symptoms.
* Valkyr (TheBerserker warframe) has a skill called "Hysteria" that darkens your vision, forces you into melee-only combat and grants NighInvulnerability for it's duration. [[http://tvtropes.org/pmwiki/pmwiki.php/Main/ShownTheirWork Actual Norse berserkers fought in a nearly uncontrollable, trance-like fury, and some theories suggest they did so by eating drugged food before battle (which also resulted in altered sensorial perception)]]. the Valkyr warframe isn't just emulating how a real berserker would fight, it's also using InterfaceScrew to (partially) give the player a sense of how a real berserker would '' perceive things''.
* All of (Classic) Stalker's weapon are designed specially to kill warframes. His bow ''Dread'' and his scythe ''Hate'', the two weapons you're likely to face in combat against him, focus on slash damage whose status effect is [[NoKillLikeOverkill Bleeding]]. His Despair are advertised as SharpenedToASingleAtom, which is in turn advertised as an anti-Warframe weapon. A Nikana stance mod Stalker can drop upon his defeat is called ''Blind Justice''. The name probably refers to [[KnightTemplar what Tenno think of the Stalker.]]
** A fairly easy connection to make, but beyond having him in its picture stance Vengeful Revenant is especially descriptive of the Stalker. A revenant is someone who has returned from the dead. The Stalker is yet another shadow of the Orokin Empire that was thought to have been completely wiped out.
* Hek's namesake shotgun deals primarily Puncture damage, making it good against... other Grineer. Not unreasonable to suspect he uses it primarily to dispose of any other Grineer who might try to get in the way of his plans.
* Ordis is a [[MeaningfulName Cephalon]] in charge of operating your Liset. In biology, [[http://en.wikipedia.org/wiki/Cephalon_%28arthropod_head%29 cephalon refers to the head section of arthropods]]. Now look at your Liset again.
* About Ordis... Digital Extreme is a Canadian studio. And in French, computer is said "Ordinateur", and often abbreviated "Ordi". In plural, it's "Ordinateurs", abbreviated "Ordis" (though the s is silent). Ordis is an AI. I believe we have a {{pun}} here.
* Why was Alad V, a ''massive'' racist against the Grineer who openly insults them to their face, ever appointed Head of Grineer Relations? That was the Corpus telling the Grineer exactly what the Board thinks of them.
* The placement of the different syndicates' rooms in the Relay seems arbitrary at first, but they're actually divided up to show which syndicates best synergize with each other. The East Wing contains Cephalon Suda, Steel Meridian, and the Arbiters of Hexis, all of which a player can progress in at the same time without having to worry about losing standing with one of them while building up another. Likewise, the same can be done with the Perrin Sequence, Red Veil, and New Loka, which are all in the West Wing. The Conclave and Cephalon Simaris are both neutral and have no impact on standing with other syndicates, and as such, can be found to the north.
* It might not be too far of a stretch to think that every time you joined a Defense mission to protect Warframe Cyropod, [[https://youtu.be/r2RR6KBlcs8 you are protecting other 'sleeping' Tenno]], [[GameplayAndStoryIntegration just like you in the very beginning]].
* Archwing in underwater maps moves slower than in space, because of the friction involved.
* When ''The Second Dream'' was released, a player in official forum made an interesting observation. ([[https://forums.warframe.com/index.php?/topic/569558-u18megaspoiler-do-not-read-if-you-havent-done-the-second-dream-vor/ SPOILER here]]) : [[spoiler: If the Warframe and the Operator are seperate entity,]] then why should Lotus worried when Vor put Ascaris Device on the player. The answer is [[spoiler: Vor just basically recreated Transferance by tapping into YOUR head and gotten too darn close to the truth in the process.]] Had Lotus not helped, Vor might be able to create his own Warframe army.
* It's repeatedly hinted that the Sentients can subvert technology. [[spoiler: Of course they can convert The Stalker.]]
* The name Tenno; [[spoiler: Update 18 reveals the Tenno human operators are the children survivors of the Zarimen ''Ten Zero'' Void accident. 'Zero' is also said as 'O'. 'Tenno' is another way of saying 'Ten Zero'.]]
* The missions on [[spoiler: the Orokin Moon]] saw Corpus and Grineer fighting each other. The game never explains why, but we can safely assume that both of them are going after Orokin technologies stashed inside.
* If you are defeated by the Corpus Harvester assassin, your Warframe is taken into Alad V's custody and you must escape through a special mission to regain access. However, you can just swap to a different Warframe and never worry about completing that mission, which almost seems like GameplayAndStorySegregation... [[spoiler:until the Second Dream reveals that the Operator really is just switching to a different remote interface.]]
* With the recent revelations [[spoiler: within the Second Dream questline]] Kubrows make perfect sense. Why would you engineer a combat dog that is also such a sweetheart to it's partner off mission? Dogs are noted to have therapeutic effects on their partners [[spoiler: so maybe Margulis made the first Kubrows as her means to heal the Tenno, but after her death they were turned into weapons of war]].
* [[spoiler: Hunhow the Sentient,]] was torn apart into thousands of pieces, each still conscious and connected to a central mind. So it's rather fitting that he was buried [[Myth/ClassicalMythology on Uranus.]]
* Ordis sometimes says a particular quote while you're on the Liset.
--> '''Ordis:''' Operator were you visualizing a bloody battle? '' '''M-m-me too''' ''.
** [[spoiler: Turns out there's a reason for that bloodlust. Ordis used to be a human mercenary well known for wanton slaughter.]]
* Why are [[spoiler: Sentient scouts]] so damn [[TheComputerIsACheatingBastard cheesy]]? They're explicitly the last nail in the Orokin coffin. They aren't cyborg wage slaves, zombies or brain-dead clones. They're monsters [[spoiler: (probably technically not)]] from another star, and you were bred to fight them in the last desperate act of a dying race. And the specimens in the game ([[NightmareFuel so far]]) are just scouts and skirmishers. Start training, Tenno.
* According to [[WordOfGod Cephalon Cordylon]], the reason foundry blueprints charge credits is Ordis siphoning off funds to maintain the ship. Otherwise Tenno would just blow their money on more and more weapon blueprints until they starve. Taking [[LateArrivalSpoiler certain recent revelations]][[labelnote:spoiler]]Specifically that the Tenno are psychic child soldiers[[/labelnote]] into account, it makes perfect sense that the Lotus wouldn't trust the Tenno to handle their own mundane expenses.
* Affinity as {{Gameplay and Story Integration}}: As a Tenno uses a weapon more and learns it inside and out, they figure out how to fit more mods into parts of it, knowing which parts of the weapon are and are not important or can be improved upon, and how they can modify the weapon without breaking it. Forma literally changes the shape of the weapon, so it can fit polarities easier, but a Tenno needs to relearn the altered shape of the weapon. Orokin Catalysts are technical devices that replicate many of a weapon's functions so more parts can be removed, while Orokin Reactors replace the complex internals of a Warframe with a smaller, more potent energy source, freeing up more room within the frame to modify it.
** The free polarity slots in prime weapons could represent a Tenno's intimate knowledge of that design, being the weapons they wielded in the Old War.
* For several of the Restores that you can make, like health and energy, it requires the resource Nanospores which is dropped mostly from the Infested and in-game says it's Infested tissue to be handled with caution. Why would the Tenno use them as components for items to heal and empower themselves? [[spoiler: Because the Warframes are made from Infested flesh.]]
** Similarly, [[spoiler:What is Helminth's purpose aboard the Orbiter? Ordis says it provides certain "biological functions", but does not mention "life support". Helminth is ''absolutely loyal'' to Nidus, and unknowingly by extension, the Operator. If you need to make a Warframe out of Infested tissue, an Infested entity that is slavishly devoted to you would be perfect for that purpose]].
* Argon crystals decay when out of the Void. It's not that inconceivable, considering that Argon is a noble gas, and they're generally known for not being very chemically active, and as such they wouldn't be able to sustain themselves, let alone generate, outside its extradimensional home.
** Which begs the question as to how they are used in components?
** Maybe as an energy source to fuel the production of some weapons?
* Frohd Bek is a [[CorruptCorporateExecutive highly influential Corpus member.]] His first name is pronounced a lot like "fraud". You can now do your own LamePunReaction.
* Titania's Spellbind not only stuns enemies but removes and protects against debuffs. She is also the only Warframe to have an integrated Archwing. Every time you cast Spellbind on a squadmate, you're activating and extending your life support bubble!
* Speaking of Titania, she mainly focuses on CC first-> avoiding damage-> dealing damage. Most of her abilities are designed to also protect her allies. Her very first ability, Spellbind, deals no damage, and her others deal damage only after disabling the enemy in some way. Taking these into account, [[spoiler: it could be representative of Silvana's horror at creating a killing machine, so she focused on Titania being able to fight, but making her abilities do as little damage as possible.]]
* The Tusk enemies on the new Plains of Eidolon can call in more troops with ease. How do the dropships get there so fast? They were making supply runs to bases on the plains, and only had to alter their course a little and drop off some soldiers.
* Why were [[spoiler:the Sentients]] out to completely annihilate the Orokin? If, as seems to be the case, they were [[spoiler:created as a colonization tool that gained intelligence]], then upon arrival the Orokin would likely begin attempting to exterminate them for "having served their purpose". Who ''wouldn't'' strike back for that?
* Baro says that Martian jellyfish are some of the best delicacies in the origin system, and pays a premium for cryotic to transport them off planet. However Darvo says despite the hype, the jellyfish are apparently nasty and nowhere near the hype that Baro speaks of. [[spoiler: Baro, being the last of the Martian Sand People, likely ate them as a child as easy to spoil seafood is often food for the poor who could afford to eat little else. He calls them a delicacy because they do taste special to him, a small bit of the life he had lost when the Grineer invaded.]]


* The Corpus, whose name is derived from a common word depicted in Orokin history. Now becomes a ProudMerchantRace that worships Orokin greed and history [[ExactWords from its corpse]][[note]]Since ''Corpus'' written in Latin, means ''body''[[/note]].
* Ever wonder why you see very few female Corpus mooks outside of the rare elite Comba and Scrambus? The Cephalon fragment for the Corpus says the Corpus crewmen are ''[[BabyFactory purpose-bred]]''.
* Here in the real world, Ceres has no atmosphere. The Ceres of Warframe has a thick atmosphere choked with sickly green clouds weeping perpetual acid rain onto the surface. When you consider it's one of the largest Grineer factory worlds, it's entirely possible that it obtained this atmosphere entirely from its industrial output. The Grineer basically enacted HostileTerraforming solely through industrial output.
* Survival missions were full of this:
** During the event that first introduced Survival missions, there was ''no extraction.'' You fought until you died. How many brave Tenno did the Lotus abandon to their doom?
** The Corpus could somehow turn off the oxygen generation for their frozen planetside outposts. Excavation has since replaced planetside Survival missions however.
* The Valkyr:
** The Valkyr is a Warframe that was a survivor of the Gradivus Dilemma, an event where Corpus exec Alad V disassembled several frozen Tenno to create his own special proxy, Zanuka, and the design of her Warframe reflects that. What appears to be some sort of mask is clearly the true form of her helmet, the inside plating quite visible in contrast to the flowing exterior, and a similar section along her spine shows the fine armor beneath the suit. In other places, what used to be the aforementioned organic exterior of the suit has been put back together with makeshift repairs, giving Valkyr's armor a very flayed and raw appearance. Furthermore, the rest of her suit is studded with pins, some of which seem to go through her arm, which could potentially be holding what's left of her exterior together. Combined with the obvious restraints that she now uses as weapons, and the constant anger and rage she barely keeps control of, and one can only imagine what horrors the Corpus did to her...
** Adding to this, take a good look at the color of the Valkyr Gersemi Armor (which is, according to the description, how Valkyr used to look like before Alad got his hands on her) and now look what color Zanuka has, both are turquoise, which implies that Alad literally ''Ripped Valkyr's Skin off!''
* Rescue 2.0 (introduced in Update 13.2.0) has Infested in prison cells. It's possible that the technocyte virus works so quickly that some random civilian, insubordinate Grineer, Corpus POW, Red Veil member, etc. was thrown in just 1 minute ago, and transformed into an Infested in as much time. It's equally possible (and potentially proven, by a recent Infested-themed questline) that the Infested are in the cells as captives for research purposes. The lengths they must have had to go through to take one of things ''alive''...
* The only indication that "synthesis scanners" you get from Cephalon Simaris are lethal is when he randomly starts talking about the ethics of murder and UnwillingRoboticisation out of nowhere, without anyone prompting him to. Considering nonlethal scanning/teleportation devices already exist, for Capture missions, that's a pretty big thing to leave out of the briefing document.
* Ancient Healer synthesis codex describe the Orokin Lorists during Infested attack. Ancient ''Healer'' who can restore health and boost armor for its allies. Does that sound like any Warframe you have?
* It's heavily implied that are still a few human colonies left. Take a good look at an unhelmeted Corpus again. And, also remember, the Grineer, during the Gradivus Dilemma, would've released the human colonies on Mars, if anyone actually fought for them. In other words, the only life a human in Warframe's universe is to either be subjugated by the Grineer, or join the Corpus as cannon fodder.
** According to [[WordOfGod Cephalon Cordylon]], there are many peaceful human settlements throughout the solar system that never encounter either faction. The Tenno never see these because they're not required to intervene in anything there. Additionally, the syndicates (notably Steel Meridian) are known to defend independent communities from Grineer and Corpus threats. The moral here is: If you're a regular human, the farther away you are from Warframe's in-game content, the better.
* Clem can only say three word sentences at most, and he's immune to the Twin Queen's brainwashing. Why? He must have been born with a birth defect.
** It seems that the Grineer defectors, such as Clem, Steel Meridian, and the Kavor, are on the whole tougher and more healthy (as evidenced by their lack of cybernetics) than the average Grineer. It seems very likely that what causes complete compliance to the Queens positively destroys the Grineer with Cloning Decay.
* "Fight poison with poison." Ballas [[spoiler: created the original Saryn Prime, [[HeWhoFightsMonsters meaning that he's sending innocent children to work as a proxy in his own revenge scheme despite knowing damn well what happened.]]]]
* In the Sands of Inaros quest, one of the enemies the Sacred Vessels can send you to fight are Denial Bursas. While it's possible that the other eight possible targets existed in the Orokin Era (blue [=MOAs=], Detron gunmen, various Grineer laborers, Infested units) this one provably did not. Inaros had to have picked this target himself using data from the outside world, meaning ''[[AndIMustScream he's still alive after being torn to shreds and stuffed in three different burial urns]]''.
* The Red Veil blatantly torture Grineer, and utilize infested runners as hit squads. [[WasOnceAMan Chargers are made from horrifyingly warped Grineer bodies]]. Put two and two together. The Grineer being tortured ''right next to the Charger Pen'' already has.
* Cephalons are created [[spoiler: through [[BrainUploading Brain Upload]]]]. And, as seen with Jordas, their use is, at the least in the [[CorruptCorporateExecutive Corpus]], still at large.
* During the Eyes of Blight, the Grineer find the extremely well-hidden Tenno relays, and will attempt to destroy them with Fomorians. The reason how they could randomly find them is simple- [[spoiler: the Twin Queens can command Teshin, who knows the coordinates of the relays, to tell them.]]
* The War Within reveals that [[spoiler: the Orokin, in order to stay young, are [[GrandTheftMe stealing bodies]]. That is horrific enough. However, both times Orokin were mentioned or shown to have died of physical causes, the reaction from others was more in line with illness than actual death. Then there is the Yuvan theater, a place where Orokin can buy slaves to possess, and all the pieces fall into place. They do not need to switch bodies to survive. Those people they [[MindRape mindrape]]? [[BodySurf Nothing more than clothing to them]].]]
** Even better, [[spoiler: the floors with the Golden Maws leading up to the theater are covered in bones. This means the Orokin used the Golden Maws as a 'selection process' for their new bodies.]]
* During the Chains of Harrow [[spoiler: Palladino states the Red Veil was formed by Rell's teachings to combat The Man in the Wall. At the time of the game, the Red Veil is devoted to guerilla warfare against their enemies. This is because, as their leader states, their doctrines call for a violent purge to purify the Origin System. This either means that ''Rell'' commanded them to be TheUnfettered and perform a purge [[GodzillaThreshold to fight]] against the Man in the Wall, or Rell's commands were hijacked by a later member of the Veil, and turned them into the Syndicate today.]]
** Some further thought sheds more light on just how ''horrible'' the Orokin were. [[spoiler: Rell]] was clearly unsuited for any form of combat whatsoever. ''The Orokin made him a frame anyway.'' A frame whose functions require it to sacrifice either energy, or its ''shields'' to empower allies. Harrow was made to be ''cannon fodder'' that lets its allies fight on just a little further.
* Ballas' [[https://i.redd.it/aul0lsopcq8z.jpg artwork]] hits the UncannyValley deeply... [[spoiler: But if you compare his eyes to that of the [[http://imgur.com/hNgKBAH possessed Operator]], you'll notice that they're eerily similar. Given that Orokin Continuity consisted of BodySurf, it's highly likely that the process is similar to the Man in the Wall, or even allowing him to be hijacked by him.]]
* The Plains of Eidolon have a day/night cycle of 100 minute days, 50 minute nights. 150 minutes in total. What the [[GoshDangitToHeck heck]] could've happened to Earth to cause this?
** It's likely just a case of GameplayAndStorySegregation; non-Plains Earth tilesets have a day/night cycle of four hours, meaning that the short cycle is just for the convenience of players.
** It could also be justified through the Unum/Tower, who are explicitly stated to have near-godlike control over the region's terraforming and the ability to see into all possibilities. Maybe s/he/it wants the Teralysts to have less waking time, but has to have SOME night lest Cetus bake?
* Grineer Tusk troops are incredibly fast to call in reinforcements, and the reinforcements can appear and be deployed in less than half a minute. A couple of minutes, they can have a base up and running again from a Tenno raid. The Ostrons will [[ForeverWar never]] be able to get rid of them.
** Consider what happens if you're just a normal person going about your business... and run into some Grineer.
*** According to rescue incursions, you get a bomb strapped to your neck.
** [[DownerEnding But the Ostrons don't have those reserves...]]
*** It's a neutral trading town, so the Tusks don't have any reason to attack, the town is said to be protected by the Unum (explaining why you can't draw weapons there), and The Ostrons have the Tenno. If ''that'' can't tip the balance in their favor, nothing will.
*** As both Saya's Vigil and Operation Plague Star show, however, this doesn't mean that there aren't Grineer or Corpus who would prefer it if the Ostrons were out of the picture. The Grineer are even explicitly stated to be trying to wipe out all other life in the system; they don't ''need'' to destroy Cetus, they ''want'' to.
* [[spoiler: The story in Sands of Inaros ends with Baro's mother being gunned down while a young Baro is desperately praying to Inaros to save her, just as the latter had done for his people in ages past. But Inaros did not answer and the Sand People would be wiped out to a man (specifically, Baro is the only survivor). In the second part of the story, Baro's mother tells that in the legend Inaros rose once more to save the colony from the Infestation, despite his body already been long since torn to shreds. So why did he not hear Baro's prayers? Simple. The Infestation came shortly after the Tenno rebelled against the Orokin, meaning that the Operators were still active. By the time Baro was born, the Tenno Operators have long since been locked away into the Second Dream and into stasis, no longer able to hear the prayers anymore.]]

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