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The Uranium Powerplant

Once a prosperous machine satellite sent by the Great Beings to observe the Inhabitants of Novum Magna,  now riddled with chaos as a new regime takes over.  For Over Ninety Thousand years, the Satellite has done its duty, however as the scales of power shift, a new regime takes control (Nebudax), turning the satellite into a uranium-producing facility. During the Great Cataclysm, a team known as the Toa Urack was sent by the Order of Mata Nui to unravel the mysteries of this glowing satellite. Just days after arriving, though, the comms between the ground and the toa team vanished without a trace. After this program, all efforts to reach the satellite were cut until now. The Uvokii, under the union between the Order of Mata Nui and the leaders of Bara Magna, have been sent with 3 goals: Uncover the truth, find the lost toa, and bring back the Mask of NRG.

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Synapse Nebula:

The Great Culling Plains;
Technology Forest and Serpent Temple Outskirts

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Red Empire:
Kanbaru;
The Burner Facility's Occupational City

Intangible Citadel: 

Library of Voila;

Magic District and Room of Prophecies

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Siege 1:
Old Deconstruction City;
Nuclear Archive Exit 3 and Toa Outpost

Important Plotpoints

Mutations:
The Uvokii were not built for such advanced radiation. Whenever they are injured, their innate elemental powers heal them in monstrous mays. 
Toa Ukzok:
New to arrive at the Uranium Powerplant with a huge ship to bring both the Uvokii and the Urack, however, those plans were soon scrapped...
The Siege and the Backrooms:
After a familiar foe takes the mask of Nrg and runs into a mysterious portal, a few Toa follow. They ended up in the backrooms, while Nebudax and his army surrounded the rest.
Destiny and Dreamwalks:
Right before the Backrooms/the unconscious universe, each toa was struck by a strange black parasite, giving them new destinies. The Dreamwalks were conducted by Hawkyre to find the lost toa in the backrooms. Dreamwalks can also have a mind of their own...
Red Empire:
The original deepest layer of the machine planet was an empire satellite sent by the great beings to Novum Magna. After the rest of the toa reached the bottom layer, the rest of the machine layers above spread out into a giant ring, reviving the warlords.
Hytherion:
The Ring is actually a sentient creature, a machine snake under the consciousness of Nebudax's desires.
Blackhole Time:

The planet collapses into a black hole, sucking the rest of the toa and inhabitants into different universes. After all of that, the merging happens, bringing the toa back in preparations for the Shattering.
Ending:
The whole Uranium Timeline ends with the last Merge Cycle and the start of the Shattering

The Entire Timeline

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Mask of Nrg: Pre-Nebudax Regime

The Whole Timeline is split into 4 major sections:
1. Uranium Frontiers
2. Backrooms and Siege
3. Aftermath/Red Empire
4. Hytherion Age

The Whole Timeline spans across two of the seven Major Sagas
1. The Great Beings Saga
2. The Oni and Dragon Saga

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Their Final Destiny is to fight against the Last Major Antagonist in first third of The Apocalypse Saga and move on from them. And for some, they have a greater purpose in the Knights of Time Saga right after.

Uranium Frontiers:

Other than the flashback, Uranium Frontier spans from Reconstruction Era and approaches the beginning of Dark Order World. By Intaganible Citadel, the Ukzok have arrived to bring the heroes back, but those plans go south as by the end of Polarity Void, some heroes follow a familiar foe into the backrooms.

Backrooms and Siege:

This is by far the longest section in the entirety of the timeline. It spans across Dark Order World all the way to sections in Oni Reborn. It is also split into 2 storylines, the siege, toa in the satellite are surrounded by Nebudax and his legion, and the backrooms (also known as the unconscious universe), where the following heroes aim to find Kojol and the Mask of Nrg, then escape.

Aftermath/Red Empire:

The shortest but most mysterious and lore-heavy section spans the entirety of Oni Reborn. It explores the esoteric history of the great beings' plan and the Solis Magna system as a whole. Not only does it strip the world of its uranium regime that stood for ten thousand years, but it also reawakens multiple universal threats that aim to destabilize the universe.

Hytherion Age:

The final section of the uranium storyline spans from the End of Oni Reborn all the way to the Beginning of Broken World. It starts with the destabilization of Novum Magna and the awakening of Hytherion, the uranium powerplant's machine ring that was stripped during the Red Empire. And it ends with the satellite condensing into a black hole at its core and causing 4 warps towards different universes.

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The Backrooms

The Toa that followed Kojol (who stole the mask of Nrg) into the portal leading into the backrooms are Nyxilara, Pennatoh, Neutrilon, Obheron, Avokus, Liftin, and Miodec. The Backrooms are unique; it is the unconscious universe where all the lost and forgotten are sent. Death out of everything is the most intriguing part. Before those toa dived after Kojol, they were struck by a black parasite, altering their destinies forever. What this did was cause them to be able to be re-found in the backrooms. This means when they die and get lost, they're able to pick back up their consciousness in the unconscious spirit realm to escape from soul snatchers and be transported into another level via portal. Most toa die and find their path to destiny through that.

There are also 4 important segments to the backrooms: Death and Rebirth, Fate Oasis's, Artifacts of Teleportation, and Interdimensional Unconsciousness. Death and Rebirth is what was just discussed. Fate Oasis's was the catalyst for Death and Rebirth and caused the most Death and Rebirth. The Artifacts of Teleportation were a discovery made that takes the majority of the backroom's time. The toa must find lost artifacts scattered throughout the backrooms to escape it from the inside to the outside. And the Interdimensional Unconsciousness is the realization that the backrooms span across the multiverse. ​​​​

And yes, before you ask, this is directly inspired by the Backrooms created by Kane Pixel and more.

A TON of storylines emerge during the backrooms because of Death and Rebirth, and it follows those who strayed from the main artifact-collecting storyline. Most of these storylines are inspired and add stories to games and media I've played and enjoyed. 

Not only do these branching storylines happen to most of the toa who jumped from the portal, but also to protagonists that joined the team along the way.

The Backrooms Expanded:
Prologue;
Level 995: Reality Aligned Houses

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Gladiators Path:
The Eyes of Seeking;
Realm of Rehabilitation and Sonder

The Backrooms Overture

Flood Escape

Medieval Reckoning

Gladiators Path

Plexus Quasar

BrickBattler

Randomized Nexus Galaxy

Elaborate

Labyrinth

Tower Defense Simulator

The Evangelion System

Tournament Realm

Grimlord Chase

Realmtales/

Brickbattler2

The Knights Whitelist

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The Eeshol Timeline
Not Affiliated with the LEGO Group™ 

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