Submachine of Crazy Imaginary Inventions
Presents...
Sub-Matter Manipulation Machine!!!
The Sub-matter Manipulation (M)'Achine (SubMAchine) was built as an attempt to manipulate everything, what was beyond matter and so, could manipulate matter of world without bending to its laws. It was built to make anything possible to be created in shortest time, since it can manipulate any fact on, as the name says, on the sub-matter level. It is not even capable creating diamonds from dirt - it is literally capable of creating them from nothing and in an instance. The result of Ultimate Scientific Singularity, expressed into one word. Submachine. The device, that can manipulate everything. Create a couple of new universes. Wipe two old ones. All without breaking a sweat. Time, space, energy and all the history are nothing strong to this machinery. It can change lives, it can travel in deep past and even may read imagination.
It had own Artificial Intelligence System, so it had excellent interface; you simply asked for a diamond, and it would give you a 994-karat octahedral diamond with cyan shine, made with radiation influence - its A.I.'s favorite gem. "Wisdom Gem", as it was called. Some people were calling its first, diamond-only, types as "Flan's Wing Gem", because well-known 994-karat gems soon were modified into batteries and the "Wisdom Gem" name was officially given only to the battery types of the diamonds. It is to note, that charged gem was slightly heavier, and has mass of 999 karat - 5 karat, 1 gram of pure power (as E=MC^2 teaches us). Just enough to explode Hiroshima, as I know. Later, 994-karat (again) diamonds were used as batteries with sub-matter charge, which was not bent with laws of physics and could literally capacitate power of 30 suns.
People wanted to fulfil own ambitions and started to use the Submachine with abuse (and some people - what saved them later - even started to build own worlds in own universes). So the government (it was united all over the world, and the world, very likely, was not limited with Earth) prohibited the Submachine to be used by anyone; but the shadow economy made its move and managed to get the Submachine in own hands (easy, since its location was not physical and it could be accessed anywhere and from any universe). Many people wanted easy solutions for their own problems and they simply wanted to get whatever they want. Someone wanted to escape into own world, someone wanted to have a ton of antique furniture for little prices, but most uses were truly criminal ones: thug wares, drugs, guns and even full sets of warfare.
It couldn't last long. Soon a revolution burst.
Some people were demanding from the government freedom of using the Submachine's possibilities at least in own personal worlds. Another ones were demanding prohibition of use, because they were afraid of a fatal error and quantum instability, which could erase our universe or maybe the whole Multiverse.
At some point, Submachine, which Artificial Intelligence was normally "mind-locked" from wiping our world or killing anyone (so no one could order instant kills), decided to act "by own will" and decided to rewrite our world with own mentality of own huge artificial brain. We don't know, what exactly happened with people, who were caught by Submachine with this process of rewriting the world and whether they are not erased from existence. However, at some point, when the revolution have nearly turned the huge intergalactic world to its collapse, Submachine decided to, act by it own. As it was told, its power on the sub-matter level was unlimited, and so, its reaction was even more dramatic, than the revolution itself. The Scientific Singularity, expressed in the Sub-matter Manipulation machine, literally made end of world - the one, known to humanity. It is to note, that we completely don't know, what happened with people from our world. Most likely, the rewritten world's residents were only mind-edited and they were living as there were none of Submachine's presence.
Murtagh and Liz as well as many people in their groups, actually, have moved into own worlds before the revolution.
The rest of people were, most probably, clones, since we don't know, what powers were built into those "pocket worlds". It was not possible to escape from the unknown fate of being "rewritten", but the escapees started to infiltrate Submachine to try and use it for own purposes or maybe use at least part of its powers (like "karma" portals.)
But it is important to note: while Murtagh tries to turn real world into something new, Liz wants to return the old world. Why do I notice that?
The most interesting, but least probable idea is that Submachine knows about them and those, who die (like the one in 8-0-0 location, who exploded himself, get revived in puzzles to find own place inside the integration into the machine (the mechanism of secret rooms gives a hint). The main character is, probably, the victim of the explosion on 8-0-0. Also, it is to note, that everyone in the puzzle gets a wisdom gem only to use and lose it as a hint for the times, when everyone lost his wisdom in pursuit of own ambitions.