All jokes aside...
There are 3 Vaults of Power that are known to anyone who has played all the Borderlands games.
The first is the Vault of the Traveller.
It is actually a living Vault. This Vault Creature called The Traveller is quite mysterious. The contents if its Vault are left unknown to the Players at the end of Tales of the Borderlands, leaving us with a cliffhanger.
The Traveller is a being that is forced to teleport across dimensions and space at random points in the Galaxy.
Atlas discovered it after they wanted to find more Vaults since Typhon found the first Vault for them.
It wasn't really the first Vault. It is just the first one that was discovered by anybody.
The Gortys project was made to force The Traveller to remain in a single area. This suceeded when Fiona, Rhys, Vaughn, and Sasha all completed the Gortys Project.
However, The Traveller was too much of a threat at the time, so Fiona had no choice but to destroy Gortys at her own request.
(A/n - Gortys has no gender but has feminine references so - she/her)
With that, The Traveller was bannished and sent back to being teleported across the Universe.
After some years, Gortys was rebuilt. The Traveller returned and fought Gortys again...but it had learned from last time.
It didn't want to suffer being teleported across the Universe again, and so it spared Gortys' life and only did self defense.
Once defeated, Fiona and Sasha enters the Vault that resided within The Traveller's body.
What happened to them remained a mystery as they disappeared and the Credits rolled.
I do have a theory of what it could be.
An Eridian...
Let me explain...
The Eridians used their life force as bait to lure The Destroyer to Pandora so that Nyriad can use their life force, which she drained from them, to power the Eridian superweapon and trap The Destroyer within The Great Vault, with the aid of her other Siren sisters.
Why did they sacrifice themselves?
The Destroyer gains the intelligence and knowledge of all the beings it consumes. This is what Nyriad had said in one of her messages.
She must have learnt this by The Eridians who had discovered the existence of The Destroyer hundreds of years before they contacted Nyriad for the plan.
The Eridains were protectors and guardians of the Universe.
They used their knowledge to trap dangerous beings like The Rampager and The Destroyer to protect the Universe. They also stored dangerous and powerful technology or weapons in the Vaults.
During the hundreds of years they had spent creating The Great Vault, their greatest prison ever made. The greatest marvel of their race's intellect.
They knew The Destroyer was intelligent. And so they devised a plan to outsmart The Destroyer by sacrificing their lives to lure The Destroyer to The Great Vault, Pandora.
It succeded and The Destroyer was sealed away by Nyriad and the other 5 Sirens. It is unknown if the 7th Siren participated in this, but given Nyriad's Warning of the 7th Siren...it is unlikely.
Why did I explain this?
Well...ask yourself this...
What is the "War" that The Watcher said to Lilith and the others?
(A/n as of the newest DLC of Borderlands 4, it is called the Time War, though no details is known yet. A previous theory of mine was that the original cultists that worshiped The Destroyer as a God would try and free it again. Especially since the Phase Dimension is the 4th Dimension of Time. And it would make sense since some cases of Time Travel in Borderlands 4 is shown in side quests funny enough. And the Phase Dimension where Sirens get their power is also what was fundamentally used to imprison The Destroyer. I mention this since MC doesn'tknow about Borderlands 4 and you known lore or non Borderlands players would be confused about this for a long long time until it becomes relevant. Right now MC is under assumption of my past theory. The Vault Cultists return for the "Great War".)
Well...shouldn't there be at least one Eridian alive to suprise Players in Borderlands 4 or 5 or 6?
It's the perfect set up.
Super powerful alien race.
Vaults made by alien race.
Game is based on Vaults by alien race.
Every game has Vaults by alien race.
The Destroyer is trapped by the alien race.
Alien race is dead.
Alien race connected to Eridium.
Alien race connected to Sirens lore.
Alien race is all dead.
Alien race reason for being dead revealed in Borderlands 3.
The Watcher, made by alien race, tells us a "War is comming"
Then to suprise everyone...one member of alien race is Alive!!!
Yep...
You get the idea...
The Traveller's Vault might have teleported Rhys and Fiona to the location of the last remains Eridian...or even worse or better yet...the location of The 7th Siren.
How do you trap the mysterious 7th Siren that even a PhaseLeech Siren like Nyriad feared?
You make a prison that has the only Vault Key and Keyhole (The Traveller) be forced to teleport across the Universe so noone can get their hands on it to open the Vault.
It's the perfect Vault for a single prisoner of a small humanoid size.
Now then...
The Sentinal Vault on Epis can show the future.
Zarpadon used it and forsaw the future.
Whatever they saw, made them try to destroy Elpis with the Eye of Helios.
Also, EVERYTHING that Handsome Jack saw had come to pass.
He only had glimpses of the future before Lilith scared his face, but nonetheless...everything he saw had come true.
He awakened The Warrior.
The final Vault of the Vaults of Power, as I'll call them, is the Vault of The Warrior.
When the Eridians were creating The Great Vault, there were other races of the Galaxy that learned of what the Eridians were doing and tried to stop them.
These individuals are like the COV in a way.
The COV worshiped Tyreen and Troy as Gods and obeyed them to open The Great Vault to free The Destroyer.
These individuals that tried to stop the creation of The Great Vault, are what I'll call Enders.
Shit name...but the only viable one since anything else is to long.
Cult of The Destroyer?
Nah, too long.
Anyway...
The Enders had worshiped The Destroyer as a God that is destined to destroy all life.
And so the Enders tried attacking the Eridians and The Great Vault.
The Eridians countered this by creating The Warrior.
A protected and guardian of Pandora to eliminate any threat that would attempt to free The Destroyer and undo the Eridians hard work.
The Warrior would slumber and would awaken on its own if necessary, but can be awakened and controlled by force by using the Pandora Vault Key, like what Hamdsime Jack had done.
The Warrior also served as the Vanguard of the Eridians to push The Destroyer into the Great Vault.
The Destroyer is the size of a planet.
The Warrior is tiny in comparison.
The Destroyer was MOSTLY trapped in The Great Vault but not completely.
Thus, The Destroyer along with other Eridain Creatures that the Eridians made had pushed the last remaining part of its body into The Great Vault.
The Warrior was on the front lines serving as the Tank class.
It was actually the perfect weapon.
It had its Slag later to use in The Destroyer and had multiple limbs to serve as extra legs to strengthen its footing so it cant be pushed back.
This was the 3 different types if Eridian Vaults that exist.
Vault of Technology - Contains advanced technologies. Vault of the Graveward.
Vault of Danger - Contains dangerous monsters and Prisoners the Eridqins had captured. Vault of The Rampager, The Great Vault.
Vault of Power - Contains some sort of power or knowledge that can be considered as power or has unknown contents. Vault of The Traveller, Vault of The Sentinal, Vault of The Serpant, Vault of The Warrior.
(A/n Vault of The Serpent is on Nekrotafeyo that Typhon DeLeon and his wife opened and had s.e.x. in. It is also where Nyriad lived the rest if her final days and died inside of. Nyriad's Soul/PhaseLeech power latched itself to Tyreen.)
This was everything I know from either the Books I bought about Shield technology, or my own knowledge of what I can remember in my past life.
(A/n Shield stuff is theory which I still need to explain a little more. The rest is from Game. Mc only got notes for Shield knowledge, the rest is past life knowledge.)
The only problem I had with all this is one thing...
Why does The Seer want to open The Great Vault and free The Destroyer?
The Seer and the 7th Siren is my most dangerous opponents ever in this Universe.
Currently I'm in a battle of Chess against The Seer.
I will be powerful enough to kill him in a 1 vs 1 fight...
As for The Watcher...so far The Watcher seems neutral, but the power it yields is absurd. Spatial Manipulation, potential Time Control to an extent. Assumed Omnipresence. Even if they are far and few, the potential is off the charts. I could be impaled right now and barely have time to react!
But until then, The Seer posses a great danger ontop of being the more hostile and active threat...
He can manipulate and control any Non-Siren being in this Universe.
I need to deal with him as soon as I can.
The Seer could take control of Maliwan, Jacobs, Vladoff, Tediore, Torgue, Hyperion, Atlas CEOs...you name it.
He can take control of anyone.
Though he can't control many people at once, kinda like Hitogami the Human God in the Jobless Reincarnation story (Anime, Manga, Novel).
Hotogami can only have 3 or 4 Apostles he can have at any given time.
Maybe The Seer is the same since he would have done so during the course of all the Borderlands Games, but didn't...
I need to knew who the Apostles that The Seer has so far...
But there is no way for me to know as of now.
That'll be an issue for the future.