Who is YU YEVON? - Final Fantasy X Backstories
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- čas přidán 8. 01. 2021
- Welcome to the next Final Fantasy X lore video, where we explore the backstory of Yu Yevon, the main reason why the world of Spira is what it is in the events of FFX. To put it shortly, Yu Yevon is pretty much the namesake of the main religion in the game, and is responsible for both the teachings and the creation of Sin. Let me know what you guys think of the video. Enjoy and consider subscribing.
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#FinalFantasyX #FFX #FinalFantasyLore - Hry
Perhaps the developer of FFX did that (how easy it is to defeat Yu Yevon), due to how he was reduced into a parasitic form to infect/possess Aeons. So much so that after defeating him, we saw only 1 pyrefly coming out of him. The source of pain and suffering of Spira, is a single pyrefly. Such an ironic depiction (in a good way) of the story in a form of gameplay.
Yes, after all the aeons he tried to possess he was practically a sitting duck, so him being the easiest boss was intentional
Not even a sending for him either, lol
Wow! That's a really cool point I never thought about! In a way, Yu Yevon was reduced to a mere idea, not a person.
Poetic
@@hardyjoe4278 that’s the reason Yu Yevon returns in the FFX-3 novel. He ejects before Yuna sends him as the spider was just a vessel. Seymour is an example on how Yu Yevon is immortal. Same goes for Sephiroth, they come back because they know how to use the life stream of the planet. In Sephiroths case is as long as Cloud doesn’t forget about him. In FFX the Yevon religion continues as New Yevon. So Yu Yevon isn’t really forgotten about…which can ultimately be his source of immortality. The backstory to Yu Yevon, Yunalesca and summoners is much deeper than you think. Yunalesca is the first person to start the pilgrimage and create the temples. The fayth of the aeons were turned into fayth by Yunalesca.
I love this game so much. It's lore is just amazing, even after 20 years.
It is a really well fleshed out story and game ahead of its time
I love lu Lu and her nice jugs
it was ahead of its time 20 years ago I remember
One of the reasons I love FFX is that the story and characters go so deep
Thats true. There is a lot of lore in the game and some of them are only touched on or details of the lore are mentioned in segments throughout the game. Its why every time I replay the game, I learn something new.
Yes, they also take much time to flesh out the characters. I mean, they even flesh out later characters like Auron and Rikku, something that a lot of Games dont do (yes, im looking at you P5).
@@f2worlds493 yes the plot is also very solid. many setup and pay off and forshadowing. good exposition with the lore (no need to read data log like in ff13)
While I didn’t go deep into the data logs or bestiaries of the games in the past, they do provide good tidbits of info I can flesh out and add into videos, but ideally yes it would be better if the story molded itself together as it was happening
Wow so many players still play this game even this game is 20 years old. That's called quality
Thats because its not just a game , 20yrs ago this was our childhood and all the players that play now are mostly adults coming back for unfinished business or nostalgia
,that i know in my soul haha
The remaster really helped get back into it
I’ve beat ffx 16 times had a couple play throughs with 500 hours on them, greatest game of all time
I'm replaying it right now on a ps2 emulator on my phone😂
@@nicknultien627 greatest game I ever played, I would love someday to have ai use it as a rough draft to create a entire world and expand on the ideas, instead of just predefined paths that feel open but arnt
I feel like Yu Yevon's design was heavily inspired by the Creator from Final Fantasy Legend, including the fact that you can instantly kill him. No one knows them, yet everything revolves around them. They are both entities that at one point desired to spare the world from suffering, but ultimately became the very thing that brings suffering. They both offer an escape from the suffering they themselves created, but the player ultimately turns down that offer. Aside from design, I would argue the only major difference is that Yu Yevon has devolved in intelligence, while the Creator has developed a god complex.
Thought it would be good to share this from Wiki:
"Yu Yevon (エボン-ジュ, Ebon-Ju) is the ruler of the original Zanarkand and the father of Lady Yunalesca. Near the end of the war between Zanarkand and Bevelle, Yu Yevon and the remaining townspeople and summoners decided to preserve the overpowered Zanarkand at all costs. They all become fayth for the summoning of "Dream Zanarkand" and then drawing on millions of pyreflies with Gravity spells, Yu Yevon creates Sin.[112][113] The mental effort necessary to create both Dream Zanarkand and Sin essentially wipes Yu Yevon's mind clean, overwriting it with his final command: summon Dream Zanarkand and continuously create Sin. If Sin is destroyed, he then recreates it by possessing the Final Aeon that defeats it.[113] In the end, Tidus' group use the aeons to weaken the disembodied spirit of Yu Yevon, and destroy him."
en.wikipedia.org/wiki/Characters_of_Final_Fantasy_X_and_X-2#Yu_Yevon
I think the strain killed him and his tick form is an unsent that clings to the world because of the strong desire to preserve Zanarkand.
I loved this game so much as a kid but to be honest, i had absolutely no idea what was happening most of the time. Looking back now with hindsight at lore videos like this and i still have absolutely no idea what was happening.
Love this, keep up the great content!
Thank you for keeping this game alive! If I ever start a channel one of the first videos is gonna be about this game lol
Can't wait to check it out :)
I am happy to see this video getting a lot of views. The way I presented this video is a bit different compared to how I make videos now considering this was done last year. I will have an “expansion” video covering Yevon as a whole at some point. Enjoy
Militant English is known all over the world by many men ok
Great video man
thank you :)
I plan on streaming the whole series one day and lore videos like these will be very helpfull
Yea that would be fun. I had the same thought but I liked recording better. I’m too camera shy for streaming 😅
Praise be to Yevon
FFX is a great game with a good story, good characters, good combat battle system, good visual graphics, and good music. It would have been nice if they did a prequel of FFX with the pilgrimage of Braska, Auron, and Jecht while adding in a backstory plot of their lives that lead into them meeting together and their time together has friends. I did not like X-2 the continuation of FFX at all because I felt that FFX had a great way to end the story and X-2 kind of ruins the story and the characters of what made FFX great to begin with.
X-2 is FILTH. The retcons are nasty and foul. And the 100% ending is just garbage and ruins the entire idea of self-sacrifice. It's the single worst, most shit, most foul, most disgusting creation of Square Enix.
edit: also yes a prequel with braska and jecht would be amazing.
Hi! Recently discovered your channel, and I must say you are doing a phenomenal job. FFX is my favourite game of all times, and I first played it on my PS2 when my cousin let me have his copy of the game.
Anyway, do you think that all of the aeons we come across were once the final aeon for some summoner? Like Anima would be to Seymour if he chose to go down that path? Or maybe all the aeons we receive are people who became the final fayth but couldn't defeat Sin?
Please shed some light onto this topic.
Hello,
I think we have similar origins to how we got into FFX, as I also first played it when my cousin lent me his copy of the game and I was hooked ever since
That’s an interesting theory but as of right now I don’t think there is correlation. I would have to look up more if there’s anything behind this but it seems like the aeons of the temple were simply willing to allow themselves to become fayth as part of the pilgrimages established by Yevon.
If there was a hint that they became fayth via the final summoning ritual then they would have gave an indication of it during the bonus scenes if you revisit the aeons before the final battle.
This makes the most sense
didnt realize yu yevon was a summoner, i thought it was the satan to god or something lmao. nice video thank you for clearing that up. really cool backstory/lore
It’s quite funny how so much of the chaos in Spira that has been happening for the last 1000 years was done in the hands of a mere but very powerful summoner lol
Did you even pay attention during the game? It's being told very clear and obvious😅
@@nicknultien627 Many missed the fact that Yunalesca said Yu Yevon is immortal... you can't officially kill an immortal unless you know its main weakness or source of power for immortality. A lot of fans that read the FFX novels are mad that Yu Yevon and Sin return...that's because the main source to Yu Yevon's power or source to immortality wasn't cut off. If anything the main characters freed him from being inside the spider that possesses aeons to create a new sin. After the main crew defeats the Yu Yevon spider, you can clearly see a pyre fly leave it and also leaves before Yuna even starts sending all the pyre flies to the far plain. Seymour was basically on that level off immortality too until Yuna sends him off after the last battle.
So are the citizens of zanarkand that were used for the fayth, the same ones you find on gagazet a little after the Seymour fight?
That is correct, and when tidus touched the fayth, he was taken to his home of dream zanarkand.
yup !
My jaw dropped when I realized the end of the game involved killing the God that everyone was praying to. Definitely not your regular video game
I think there’s a trend on some (if not most) square enix games that always implements one of 2 major elements: a crystal like object being a symbol or vessel of power, and once worshipped gods that the protagonists have to face and defeat to rid the world of chaos and destruction.
@@f2worlds493 yeah I agree. Also noticed this in FF13 with the Fal’Cie. I’m surprised Square Enix doesn’t get responses of controversy from religious organizations. Unless I’m unaware that they really exist
Almost every jRPG has this agnostic plot element
I never understood where sin came from, despite having played the game so many times. Despite the religion kind of being showed off as mostly fabricated, i just assumed its origin coming from an overabuse of machina as being the extent of that tale. Spoliers for AOT if youre not caught up on the show, but....
It's crazy how similar sin is to the rumbling now that i know its origin. Yu yevon knew his people were going to lose the war, so he threw zanarkand in the confines of sin to blissfully dream in a state of death while sin purged everyone else. Pretty crazy
Its funny when you consider, the whole suffering across spira because of Sin and its cycle, the corrupted religion in his name, the persecution of the Al Bhed, the suffering and chaos, all around his cult, and in the end, he was nothing but a simple, weak parasite, one that needes to surround himself in the protrction of other powerful entities.
And once all that was stripped away, all the puppets he could no longer control, he was defeated so easily, a nothing parasite.
That is what all cult leader are, they create the illusion of invulnerability be those they manipulate around them, but ultimately, they are just weak flesh and blood as anyone else.
Exactly
Their strength really comes from their surroundings. You take all that off, and they are much weaker than you initially anticipated
Imagine creating a superweapon like Sin to counter Vegnagun
You forgot to mention he loved the blitzball, and probably he was a blitzball player, since they use the biltzball sign to praise him.
Also in the imaginary world of spira, memories of the dead can gather to create creatures. That is the theory of the summons, that summoners can collect memories to create creatures.
nice
So, technically Sin was "just" a weapon went out of control by his creator who didn't know the consequences of his choice?
So they talk about summer before the war even happened but what all aeons were around back then all the fayth we interact with make it seem like they were made during the war
.. so like were there more and different summons at one time
THANK YOU this FINALLY clarifys SO many things to me ghat i dis not understand back then and EVEN now
I wish we get a remake of this game and if we do I'll watch YOU streaming it instead . I just hope we are all alive when the remake drops
Haha true. With so many rumored projects who knows when that will come
6:46 - "...and that, as they say, is that."
Praise be to yevon
Do you know what Kind of buildings [Sin] got on its back ?
Great Video!!
I don't think there's anything certain about what they actually are aside from that they are buildings from the original zanarkand
My favorite theory is that they were the buildings yevon was originally in when we summoned sin during the machina, which would have meant sin arose from the ground
Also thank you. I am surprised at how well this one did compared to the others
@@f2worlds493 just saw a Video "ffx out of bounds secrets" by Shesez Shows all of the buildings are conplete create. You visit them the time you are under macalania Tempel 😱😱😱😱😱😱
Great video. A few corrections:
- The calm does not last 10 years. It is believe that the longest calm was 10 years, but for example Braska's calm lasted around 3 years
- The first time Yu Yevon is mentioned is actually by Maechen in Gagazet. It is a non-obligatory dialogue of course.
I wonder what the final aeon before braska's final aeon was, since we know it's jecht. And jecht was used to kill the final aeon that was before him, It surely wasn't yunlesca and her husband. There must have been someone else
The Final Aeon is created anew each time; as shown by Jecht, the FA is essentially the selected Guardian made into a super-hulked-out version of themselves as a temporary Aeon. Temporary, because there is no stone fayth, no anchor point, no permanency (remember the empty, powerless statue Yuna remarked upon when they reached Zanarkand's Cloister?) as with all other Aeons (including Anima! which means it is not and cannot be considered a FA!). Temporary because when the spirit of the sacrificed Guardian is used up/consumed by Yevon/Sin it is GONE. Eaten. Utterly annihilated, nothing left to go to the Farplane. THAT is what Yevon does, to survive. That is the whole point to the pilgrimmage, from Yunalesca's point of view. To serve up a new morsel to keep her father "alive". The first such morsel she served up was her own husband, remember!
@@xheralt re read the question, I hate people who can't comprehend simple things, yet just waffle
It was Lady Yocun's guardian. We see an image of her (generic female Crusader NPC) when you enter Zanarkand Dome.
where did you get the 10 years before Sin ressurects thing?
I,ve ever seen it mentioned before.
great video!
Potentially misinformed on my part. I was under the impression that since its been 10 years since Braska defeated Sin and by default, thats how long it would take for sin to return. I will take a closer look at this
@@f2worlds493 you were correct it's said multiple times by several characters. Particularly when initially explaining the Calm to Tidus.
This is a common misconception. There seems to be a fair few people that think that The Calm lasts as long as the time there is between each high summoner, which is incorrect.
Noting that Auron needed to ride Sin to get to Dream Zanarkand to watch over Tidus, and that Tidus was still a child when Auron arrived, Braska's Calm lasted a year, at most, though more like only several months. The four other Calms would have been the same
@@deathseekergibbsy? Auron visits Tidus when he's young and also sent Kimahri to bring Yuna to Besaid when Yuna was a child. The calm has been 10 years at the beginning of the game.
I remember an NPC mentioning the Calm lasted 3 months. But that was a long time ago. I need to go back and find that tidbit.
If Al Bhed as a language didn't exist before that means it was actually a cipher that became its own language, specifically to circumvent Yevon? Don't know if anyone's mentioned that yet
Hi, do you have a patreon page. Would love to support your work and if you can do FFX-2!
Hey,
I do not have a patreon page at the moment, but I appreciate you willing to support my videos and the channel. :) It is definitely in the works for the future as I am on my own on the channel.
FFX-2 will definitely be covered as I come up with more topics for FFX as they are connected and I make sure to include details from it depending on the topic I cover
What? He is reading directly from final fantasy wiki page! finalfantasy.fandom.com/wiki/Yu_Yevon
It has a leader syndrome. Its easy but the hard part was getting to it
This is like when you see Trema just before meeting Yunalesca. Then, you find out his secret identity in the next game.
Also, I don't think Yu Yevon was meant to be the final boss. Had he been paired with Final Aeon Jecht, then maybe.
Can you tell me the name of the Soundtrack used?
I used the song of prayer in the beginning
And then the contest of aeons and servants of the mountain soundtracks from the game
Yu Yeven was afraid of death the whole time it seems?Can I use Doom on him?
What I want to know is how Jecht got to Spira in the first place. Did Sin come to visit him during a fishing trip? Because the only way I'm seeing how to leave Dream Zanarkand is through Sin, somehow.
Jecht went far out to sea to train for Blitzball and accidentally touched Sin who spat him out to Spira
@@serphv6531 Right, but how did Sin get there in the first place?
@@kukukachu Sin swims around Zanarkand sometimes as explained by the Faith of Ifrit
@@serphv6531 ah. Must have forgotten about that part. I guess it would make sense if any shred of Yevon was in there.
@@kukukachu its easy to miss if u dont go back and revisit all the Fayths.
Did I really understand your description correctly in that Yu Yevon wiped all of the city he tried to protect by taking their souls to make a fake zanakarand and Sin which destroys technology anyway? Wasn't his intent to protect people from technology? Why destroy a city just to make a fake version of it? Why have yunalesca sacrifice Zeon to make a final aeon? Why even create this whole summoner pilgrimage process? His goals dont seem to match his actions at all
If I may. It was more to do with him being unable to accept defeat, and he wanted his city to last forever the way he remembered it (at the height of its power, pristine, not at war with Bevelle) that's why he turned everyone into fayth to summon the Dream Zanarkand.
You're right, the official narrative makes no sense. I have a different take on it. The final stage of the machina war was a tense deadlock. City of St Bevelle had Vegnagun, but due to control issues _didn't dare_ deploy it. They did however release carefully edited footage on the spherewaves, running a literally colossal propaganda bluff to try to get Zanarkand to surrender. Zanarkand's response is desperately developing Sin as a weapon of last resort in a secret military lab. Zanarkand smells a rat, and sends Lenne & Shuyin to infiltrate. They are tragically killed, but the disturbances in the -Force- Farplane when Shuyin takes over V-gun allow other Zanarkandian sensitives to penetrate the veil _just enough._ The governor of Z-kand (NOT Yevon!) realizes he no longer needs the dangerous and likewise seemingly uncontrollable (in tests) Sin project, and tries to pull the plug. The military summoner (the body in the now-lifeless fayth of Zanarkand Cloister) reacts by improvising a quick-start Summoning. It goes horribly wrong. His berserk anger at being (in his opinion) betrayed by his own is why Sin's first target was Zanarkand itself. The core of Sin is the military lab where Sin was developed and surrounding turf, excavated like a melon baller (or Borg cutting beam). This is the lifeless architecture seen inside Sin. Refugees streamed out of ruined Zanarkarnd; while the Ronso were sympathetic, they could not contain such numbers and forced them to continue southward. In the foothills of Gagazet, the forwardmost refugees, Yevon at their lead, realized their next problem -- the army of the City of St. Bevelle, camped out in what is now the Calm Lands. No way forward or back. Yevon then crafted his greatest work: the eternal free-running simulation that is Dream Zanarkand, using the thirty(?) some refugees with him (melded into the cliff face as fayths). The memories of these people serve as the ROM, Yevon's Summoning is the game engine. These permanent members are duplicated as needed to populate the city, and have perception filters to not notice their "twins"; madness lies that way, otherwise. The attack on DZ where Auron yeeted Tidus into the real world (of Spira) caused a reset, back to default vanilla, which is why Tidus's houseboat was empty, later. I'll bet anything if he'd gone to the stadium on his return visit, no-one would have recognized him, nor heard of either him or Jecht. Sin attacks the refugee encampment, and Yevon pulls his first "aeon siphoning" trick to depower it and stand it off. But Sin has an irreducible core...its fayth. Yevon uses spirit connection with daughter Yunalesca to recruit and send her on a mission to Zanarkand...to attack the fayth of Sin, to break the connection between the summoner and summons, so that Yevon can seize it. 'Lesca knew from the outset her husband would be sacrificed, but her love for her father was greater. She does this, then swaps the (un-anchored) soul of Zaon in place of the ousted spirit of the original summoner...and Sin has its first meal, to begin the cycle. Because Yevon can only truly consume an unanchored (Final) Aeon (or more properly, the part of the soul the summoner invested in the Aeon), all other Aeons have their indestructible cenotaphs (souls sealed in stone) to rebuild from. That's MY theory, in a nutshell.
stAY awAY frOM THe SUmmONERrr!!
YoURe a bAd MaN
Should have been the serious final boss, after Braska's Final Aeon.
Is Dream Zanarkand an Aeon?
So because you said that yu yevon wanted to turn zanarkands people into fayth is sin essentially the Aeon of all of zanarkand Using one person as a vessel or special fayth to shroud in sin armor. ? Lol or is sin just one fayth shrouded In armor made out of pyreflies ? Im confused lol
The idea behind that statement was to point out that Yu Yevon wanted to preserve Zanarkand since it was losing in the machina war, which resulted in zanarkands people turning into fayth in order to conjure a “dream” version of zanarkand. Sin is a completely different being created by Yu Yevon. A video dedicated to sin is definitely coming out. I’m not running a FF lore channel, cover FFX and not make a video on one of the most significant beings in Spira 🤣. Hopefully it will be explained better there
@@f2worlds493 yeah please explain in simplistic dummy terms for me hahaha 😝
@@AdamSmith-ml4ji No, Dream Zanarkand in itself (including Tidus, who was born 983 years into Dream Zanarkand, after the Machina War), is the Aeon or summon of Yu Yevon, that is comprised of the fayth that were once the actual real people of Zanarkand. Sin was created for Yu Yevon's protection as well as the destruction of anything that thrives in Spira or whom dares to attack it. It was created by the pyreflies of the dead. Yu Yevon is deeply shrouded in Sin. That is how Sin was able to reform and stay alive for so long.
@@kingsarverjr502 According to Maechen, the invading army of Bevelle saw the massive fayth on the mountainside and a massive creature coming at them. So they thought Sin was the corresponding summon. This was a useful sleight by Yu Yevon who wouldn't want anyone to know Dream Zanarkand is the actual summon.
Honestly, i dont blame Yu Yevon. Bevelle blew up Zanarkand and he just wanted revenge in a sense. It went a little far, like 1000 years too far but wouldn't you want to retaliate if you were Yu Yevon?
Uh 4:00 you were wrong there. She never reveals Sin can never be truly defeated with the final Aeon. If she did people would give up on it and start looking for other ways. I feel some other summoners may have wondered and asked but Yunalesca probably killed them to keep them from revealing the truth or the people just didn't believe them and never passed the knowledge down.
Why would YuYevon order Sin to destroy the original Zanarkand... his homeland he was trying to preserve?
That's the only thing that doesn't add up to me. Great video as always though 👍
Yu yevon lost control of sin so it only did what yu yevons initial instructions for it were, protect himself and destroy growing/established cities, usually machina cities, which the original zanarkand was :(
remember one of sins basic rules,"destroy technology cities before it goes too far" which zanarkand was one of it, that and losing control of sin so yeah its not that hard to understand why
So my question is why is Jecht Sin,If its yu yevon? Im kinda slow. And i dont get how Tidus fits in everything... is Tidus from the Past? From the real zanark? Was aaaron?
So this video mostly covers Yu Yevon as a character so i tried to focus mostly on that, but to answer your question, Its almost like Jecht is serving as a vessel for Yu Yevon (hence its parasitic bug like state) but at the same time, Jecht is the core of Sin. when the final aeon is summoned and defeats Sin, Yu Yevon moves from the old sin and possesses the Final Aeon, which he spends 10 years to form a new Sin. Jecht became the final aeon because of Yunalesca's ritual of transforming a guardian to the final aeon at the end of the pilgrimage.
As for Tidus and Auron, I can cover that storyline in a lore video where I explain the prologue of the story leading up to the events of the game. Unless you pay really close attention word for word, it will be hard to know the story of dream zanarkand since details are explained in bits and pieces throughout the game instead of a whole segment dedicated to it. It took me a few playthroughs before getting the grasp of the story.
Jecht became Braska's final aeon so he became the next sin. Tidus was essentially from the past as he was brought to Spira 1000 years in the future. Auron was an unset and was able to bring Tidus to spira
I may want to add some things. Tidus wasn't from the past. When they (Wakka, Lulu, etc) said that Zanarkand was destroyed 1000 years ago, that Zanarkand wasn't Tidus' home. His home was the dreamed Zanarkand. They lived in the same timeline but in different universe, as if they were in parallel universes. Jecht was transferred to the real living world first to fight with Braska and Auron (who was once a living soul from Spira), and then after 10 years of calm, Tidus was sent next. Auron was already dead by the time he went to get Tidus from the dreamed Zanarkand, that's why he was able to travel into that place. Because he was just a wandering soul.
Every 10 years Sin is defeated and given a new host basicallly. The last one being Jecht.
@@Mezu98 it's funny how everyone is confused with the whole "tidus come from the past" even after having play the game. the concept of zanarkand and tidus being a dreams is probably too confusing
you have the strongest asian accent ive ever heard
you didnt mention the dark aeons, penance, etc.
They have no relevance to Yu Yevon.
@@toxicity791 they do. they are summoned by his minions with penance beeing his final weapon....
@@dervakommtvonhinten517 that’s incorrect.
The Dark Aeon summoners work for Yevon the religion - not Yu Yevon the summoner. They serve Bevelle.
Penances’ origin was never established, whether it’s a fiend, Aeon or machina. Popular theory is it being a machina super weapon created by Bevelle during the machina war, but ultimately the boss was an afterthought for the international releases and will never have a meaningful origin.
So, if the Yu in Yu Yevon is the surname that means Yunalesca given name is Nalesca?
Ooh, Yuna's first name is Na! Just kidding.
I didnt know yunalesca was yu yevons daughter.
She is indeed. He also provided her with the instructions on creating the final aeon and defeating Sin.
You can cast doom on yu yevon and he will die in 3 turns. He is the only boss doom works on.
A bug!
makes me uncomfortable think about yu yevon construct his armor during 10 years with the final aeon conscious
"Yu Yevon is one of the easier final bosses in the series."
No; he's the easiest. The only way he isn't is if you don't even consider him a boss; because it's literally impossible to lose to him unless you *self-petrify your entire party*
Who is Yu Yevon you ask? he's a tick...
"I'M DOING LAUNDRY!!!!"
Yuna is so beautiful ever
I don't remember any of this from when I played it. Story's not so bad after all.
Yea id say its alright lol
i don't consider yu yevon to be the final boss. anymore then time devourer in chrono cross. braskas final aeon and dragon god are those games true final boss's repsectively.
yu yevon is literally thanos. dream zanarkand had finite resources to support it and was populated solely by memories of death or dead people. every time population gets too high somewhere else and drains resources from dream zanarkand, sin comes and thanos snaps the population down to a managable size.
It is unbelievable that despite the power and terror of Sin, very little is mentioned about its creator in the first place. It takes an incredible amount of strength and wisdom to create such a creature to begin with.
Who is Yu Yevon? A convenient and purposefully obtuse plot tool. The Final Fantasy games stories is mainly focused on interpersonal stories, that is the relationship of the characters, the lore is secondary.
Yu Yevon isn't the final boss, the official strategy guide states Braska's final aeon is the final boss.
Yu Yevon is clearly a scripted battle.