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  • One day while playing Terraria, I could NOT stop thinking about the Crimson, and why it's like it is. But, today, I've put facts together, and come up with a Theory.


    So, when you enter the Crimson, the world is all bloody and gory and such. Well, when you head to a Crimson cavern entrance, you can see that the Stalagmites and Stalagtites actually look like TEETH. So, the entrance would be a Head or something.

    When you go down through the entrance (I'm not going to describe it any further), and go into the Crimson Caverns proper, there are Crimson Hearts in the wall, obviously. Now, when you smash three of them, the Brain of Cthulhu will spawn and try to kill you. When you smash three hearts, it may be reminiscent to a HEART ATTACK, for a creature I will explain later.

    When the Brain of Cthulhu spawns, it will try to get rid of you, stopping the "heart attack", by killing you. When you destroy all of the Brain's CREEPERS, the Brain itself will split open through the middle to reveal a HEART WITH EYES. The Brain may be a separate entity to the Hearts and what THEY are connected to.

    Back to the cavern's entrances. When you somehow manage to get the Brain of Cthulhu to position itself perfectly inside of the cavern entrances, you may notice that it almost perfectly fits in the full cave size. The "Teeth" are also there, and since the Brain fits closely enough to the size of the cave, then it may be Cthulhu himself.

    Since you can battle the Brain as much as you want, that may indicate that Cthulhu had multiple brains, or multiple heads.

    When you look down at a map of the Crimson Caverns after exploring them, you will notice that the main cavern looks like it could be a creature's Torso, and the caverns leading down and splitting into multiple paths look like HANDS. This may also make Cthulhu have multiple bodies.

    That means that for every "Torso", there are multiple entrances, and multiple hands. Every Entrance is a Head.

    Since the Crimson Caverns do not move, that means Cthulhu is either dead or dormant. Most likely dormant, as the Hearts actually BEAT.

    The EYE of Cthulhu could be something that watches down on the world, planning the next move for when Cthulhu revives, which he will not, because of his hearts being smashed, and/or a possible magic spell that binds him. The Brain of Cthulhu may be a separate entity that watches over the Crimson, protecting it.

    Back to the grass mentioned WAY earlier in the theory. It's Bloody. That means that Cthulhu was possibly slain by another creature, and the bloody grass is Cthulhu's blood, itself.

    The Crimson is Cthulhu's dormant body.


    Thanks for reading this theory. I may post more when I think of some.

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    • Wow i never thought of it like that

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    • Cthulu have many eyes, but Cthulu just have one head. and no teeths, so i think your theory its wrong, also Cthulu skin is green, he's a water monster but he can go out of water, Cthulu also have many tentacles

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    • That is not exactly a locked appearance of Cthlulhu, though, as it is just a game MOD. Future mods may have Cthulhu having different looks, sizes, abilities, etc.

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    • "A monster of vaguely anthropoid outline, but with an octopus-like head whose face was a mass of feelers, a scaly, rubbery-looking body, prodigious claws on hind and fore feet, and long, narrow wings behind."

      -H.P. Lovecraft, The Call of Cthulhu

      This leaves little except the color to be decided. In addition, does the Crimson accommodate for any body parts that a standard human would not have (i.e. tentacles, wings? I can see the tunnels being tentacles, but...)

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    • However, that description said above does not state whether or not Cthulhu has teeth, and I'm pretty sure that some octopi have teeth, so Cthulhu would also have teeth, anyway.

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    • True, but that's only part of the problem.

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    • The water at the bottom might be blood trying to clot. Maybe that's why water in the Crimson is red.

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    • Mhm, it just so happens Cthulhu is made of red stone and hundreds of hearts. And if you smash his hearts, his brain materializes out of nowhere and is protected by flying eyeballs. It all makes (no) sense now.. Lovecraft must've been really baked when he came up with this.

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    • This is just a theory. Also, it would be Cthulu's dormant state, so he/she/it would be petrified. And when you kill 3 hearts, the brain would recognize you as a threat and attack you. Don't know why the Creepers look like eyes.

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    • Cthulhu is green. Not red. This isn't supposed to be like him and dormant just means in a deep sleep. Nothing about being made of stone. And what would make him turn to stone? Why does he allow you to crawl all over his insides? Why does he have satanic altars inside? Why does he eat those abandoned houses (In this temporary world I have, theres 2 abandoned houses in a crimson cavern)? And its not in a cthulhu formation. Unless hes also made of dirt and red grass.

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    • I myself haven't entered the Crimson Cavern, but from a fresh perspective, some of you aren't thinking about this enough. These points are in order of reasonability.

      1) If you were buried to the neck, you wouldn't be able to move. If Cthulhu was x times larger than you, the pressure on it would not be x times stronger: his sheer surface area would make the pressure multiply exponentially. Millions if not billions of tons of pressure would be exerted on it.

      2) Cthulhu could still be dormant and petrified, if only partially. When organic matter is submerged for millennia, minerals leach into the matter, fossilizing the remains. No animal has lived long enough, much less survived the extreme pressures, to be fossilized alive. Regardless of this, the immense pressure would no doubt constrict blood flow (much like when our limbs "fall asleep"), except to the point the for all intents and purposes, Cthulhu's exterior is dead. There is no reason except magic that fossilization wouldn’t occur, although it would happen at a slower scale.

      3) This game has magic, and someone has been here. In most magic realities, what came before was stronger. Imagine: you’re digging around and find a golden chest with a spell in it. The only reason they would have left that spell is because they had something better. The heroes/rogues of the surface Dungeon for example: They had the magic skill to keep one man alive long enough to find him, turn him into Skeletron, turn him back, and summon the Dungeon Guardian if you try to sneak around the trial (yes, they want someone to enter the Dungeon), as well as animate their bones. They were probably the ones who imprisoned Cthulhu in the first place. If so, then perhaps Cthulhu cursed them all in such a way to spite them. This “Old Magic” theory is further supported by  "The ancient spirits of light and dark have been released" and the Ancient armors. They are Shadow and Cobalt: one the best Pre-hardmode armor without going to hell (also, someone lived in the Underworld besides the demons and imps, and they had dolls), the other the next step upon entering Hardmode.

      4) This game is highly reminiscent of Norse mythology with the dead vikings, giant tree(s), and multiple worlds. When the Norse gods killed the first being, Ymir the Frost Giant, "From Ymir's flesh the earth was formed, and the rocks from out of his bones; the sky from the skull of the ice-cold giant, and the sea from his blood."

      5) This is a game, and as such the creator(s) has the right to creative license and can create, use, and combine his/her original ideas with common lore and old ideas. The description doesn’t have to match records of Cthulhu for Jboy91’s theory to be correct: It depends on what the creator intended to create. It is obvious to me that the Crimson Caverns have cave entrances (with teeth, I have seen those) opposed to deadly trenches that you die on impact if you fall into for a reason. I imagine the creators put much more thought into the Crimson than the Corruption to make a brand-new, challenging experience for the gamers to play, wonder at the origins of and have intelligent discussions about. I think your theory is sound Jboy91. Good job! Now I feel like I’m on Game Theory or something.

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    • Great theory

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    • +Kuichio

      I was actually reading it out loud like MatPat from the Game Theorists while typing this, TBH.

      I want the Game Theorists to actually make this into a video.

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    • The game theorists are awful. They tried to pick apart the binding of Isaac and "crack the code" when the game makes it evident of what is happening. They just find simple games and try to make failed videos of them.

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    • Kuichio wrote:

      I myself haven't entered the Crimson Cavern, but from a fresh perspective, some of you aren't thinking about this enough. These points are in order of reasonability.

      1) If you were buried to the neck, you wouldn't be able to move. If Cthulhu was x times larger than you, the pressure on it would not be x times stronger: his sheer surface area would make the pressure multiply exponentially. Millions if not billions of tons of pressure would be exerted on it.

      2) Cthulhu could still be dormant and petrified, if only partially. When organic matter is submerged for millennia, minerals leach into the matter, fossilizing the remains. No animal has lived long enough, much less survived the extreme pressures, to be fossilized alive. Regardless of this, the immense pressure would no doubt constrict blood flow (much like when our limbs "fall asleep"), except to the point the for all intents and purposes, Cthulhu's exterior is dead. There is no reason except magic that fossilization wouldn’t occur, although it would happen at a slower scale.

      3) This game has magic, and someone has been here. In most magic realities, what came before was stronger. Imagine: you’re digging around and find a golden chest with a spell in it. The only reason they would have left that spell is because they had something better. The heroes/rogues of the surface Dungeon for example: They had the magic skill to keep one man alive long enough to find him, turn him into Skeletron, turn him back, and summon the Dungeon Guardian if you try to sneak around the trial (yes, they want someone to enter the Dungeon), as well as animate their bones. They were probably the ones who imprisoned Cthulhu in the first place. If so, then perhaps Cthulhu cursed them all in such a way to spite them. This “Old Magic” theory is further supported by  "The ancient spirits of light and dark have been released" and the Ancient armors. They are Shadow and Cobalt: one the best Pre-hardmode armor without going to hell (also, someone lived in the Underworld besides the demons and imps, and they had dolls), the other the next step upon entering Hardmode.

      4) This game is highly reminiscent of Norse mythology with the dead vikings, giant tree(s), and multiple worlds. When the Norse gods killed the first being, Ymir the Frost Giant, "From Ymir's flesh the earth was formed, and the rocks from out of his bones; the sky from the skull of the ice-cold giant, and the sea from his blood."

      5) This is a game, and as such the creator(s) has the right to creative license and can create, use, and combine his/her original ideas with common lore and old ideas. The description doesn’t have to match records of Cthulhu for Jboy91’s theory to be correct: It depends on what the creator intended to create. It is obvious to me that the Crimson Caverns have cave entrances (with teeth, I have seen those) opposed to deadly trenches that you die on impact if you fall into for a reason. I imagine the creators put much more thought into the Crimson than the Corruption to make a brand-new, challenging experience for the gamers to play, wonder at the origins of and have intelligent discussions about. I think your theory is sound Jboy91. Good job! Now I feel like I’m on Game Theory or something.

      Way to ruin a fantasy game with scientific facts and statistics. Its a fantasy game. Do not pick it apart.

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    • Momocrisps wrote:

      Kuichio wrote:
      <snip>

      Way to ruin a fantasy game with scientific facts and statistics. Its a fantasy game. Do not pick it apart.

      It was an alternative view on a given theory. The forum is a place for discussion, not for telling people not to discuss.

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    • And not for you to keep telling me everything I do is wrong. Is my breathing also being done wrong? Walking? Eating?

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    • Momocrisps wrote: And not for you to keep telling me everything I do is wrong. Is my breathing also being done wrong? Walking? Eating?

      Whenever did I say that? I am simply informing you that the forum is for discussion, not attempted prevention of discussion.

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    • It's alright: I understand Momocrisps' view. Haters gonna hate, but why continue reading if the first theory displeased you so much?

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    • Kuichio wrote:
      It's alright: I understand Momocrisps' view. Haters gonna hate, but why continue reading if the first theory displeased you so much?

      Because you guys necropost and it appears on the notifications. Why the hell else. If you are gonna ask me why I continue reading, allow me to ask why you made necroposting your hobby,

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    • Momocrisps wrote:

      Kuichio wrote:
      It's alright: I understand Momocrisps' view. Haters gonna hate, but why continue reading if the first theory displeased you so much?

      Because you guys necropost and it appears on the notifications. Why the hell else. If you are gonna ask me why I continue reading, allow me to ask why you made necroposting your hobby,

      Uhh, this thread isn't old enough (nor has the post time difference been large enough) for any of the posts to be considered necroposting. Also if the notifications are the problem you have with the thread, there is a button right up the top to unfollow the thread's progress which you're more than welcome to press.
      HereIsWhereYouCanFindIt

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    • I have a theory, not an argument. I'll save it (argument) for later, but here it(Theory) is:


      The Crimson is the INSIDE of Cthulhu, and he has died and become skinned by a greater something. Skinned for a trophy, perhaps. Or to make powerful armor / clothes. He himself is dead, but his organs are still alive because of Cthulhu's BLOOD. It has not clotted yet, so it might be still keeping his ORGANS alive. That is why his brain and eye (s) are still alive. The reason why I say eyes is simply: Cthulhu has four eyes. One is inside his brain + heart, one is detatched from his ??? to watch over the world while he is half-dead, and two might still be inside him. THE TWINS. (He must be able to regenerate his organs somehow, because I can and have fought about 12 Eyes of Cthulhu. And 6 Twins.)  

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    • I think i know why Eye of Cthulhu can be fought many times: It is a FALSE one. because when you kill one of Moon lord hands, it spawn a TRUE eye of cthulhu, so, yeah, that's all i wanted to say.

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    • ALL OF THESE THEORIES ARE MAKING MY HEAD EXPLODE

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      • brain pops*
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    • Shame that Cthulhu is a squid like creature so the multiple head simply would not work

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    • I have 2 Theorys: 1. The Crimson is Cthulhu but not dormant after it was rudely awakened by the underworld's guard's death(Wall of Flesh). It then start spreading through the world and destroying all life in it to avenge the Wall of Flesh. The monsters of Crimson is guarding its master. 2. Cthulhu is slaughtered by a greater force(Moon Lord)and it cursed the land to hide its brain and constructed the eye to seek revenge on the moon lord. After the player slay the Eye of Cthulhu Crimson made the twins in Hardmode.(Moon Lord is responsible for Cthulhu's death because when a part of Moon Lord dies it summons a True Eye of Cthulhu)

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    • I have read so much about Cthulhu being green!

      But what if he was skinned?

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    • I have 2 theorys. My first theory is the moon lord had a big battle with cthulu and won but lost his legs and the crimson is cthulu's blood,the bosses like eye of cthulu are cthulu's body parts cursed to roam the earth and the character just literally appears so I think the character is cthulu and is trying to get revenge. My second theory is the crimson is the krake.on my world there are two crimson caverns and both of them look like the kraken and when I was looking at urban legends, It said there were 2 krakens.

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    • i think the crimson is cthulhus remains trying to create a womb to create a new cthulhu. and that it needs to completely take over the planet so it can create an embryo. and the brain of cthulhu is controlling it all

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    • i saw a good theory somewhere that cthulhu came to terraria because he heard a call from another god *thats a whole other story* and started terrorizing the residents of terraria. eventually a hero was able to defeat cthulhu. and since he can never be truely killed. the hero dismembered him and his remains slowly formed the crimson. and any creature that touched it would become his servants and help spread the crimson so cthulhu could be reborn.

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    • guys, there r sum rly good theories, but u hav 2 remember that Cthulu has not been added yet

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    • Ok i think that moonlord and cthulu had a huge battle and cthulu lost to moonlord and his body parts were  turned into the cthulu bosse ex: eye of cthulu: and for chtulus last attempt to killing moonlord cthulu sent you the player to this world to defeat moolord and to avenge cthulu and that is my theory to this fandom on cthulus dormant body 

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    • i've killed the eye of cthulu 3 times. cthulhu has many eyez. all with 20/20 vision and a mouth bursting from it

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    • A FANDOM user
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