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The Void
A state of emptiness in between Au’s. Space bridges and entities capable of Teleportation may catch a glimpse of these locations, but nothing beyond that.
However, ever since the Starscream arrived in the void, fractures started to form, wild portals that allow objects to drop in, as well as other life forms. And not everyone is friendly.
Jasper was tinkering with a teleportation device on the day they found themselves in the void. It broke down and resulted in a divide appearing in all three universes. The machine violently fused with Jasper's spark upon his arrival, granting him abilities akin to those of Skywarp and TC.
Silver was inside a dark energon mine when Jaspers' machine malfunctioned, leading to an explosion and a tiny shard piercing his spark.
Maroon found himself in the void with the Allspark atop his head. It attempted to safeguard its host by creating a portal back, but it wasn't quick enough. They believe the All Spark on Maroon's head is crucial to the cracks between the universes.
The main reason these idiots aren’t trying to kill each other at the current timeline is that they can’t stand the thought of being alone and trapped. Additionally, they need one another to find an escape (do they even want to escape anymore?). And finally, they just decided that it was way too exhausting to be enemies and became friends/comrades (after being together for a thousand years, they're just exhausted).
(This AU is where all my hyperfixations interact :D)