Soul Translator

The Soul Translator is a machine developed by RATH to serve as the next generation FullDive device, which can not only read a person's brain waves, but supposedly, copy and overwrite them.

Background and Development
The architecture of the Soul Translator is based off the MediCuboid, which in turn was based off of the machine Kayaba Akihiko used to clone his brain onto the internet. The Soul Translator was made to produce soldiers for Japan but government funding for the machine was provided under the name of «Maritime Exploration Development».

Testing
Initial testing was to try cloning human souls (or Fluctlights, in RATH terms) and use them as soldiers, but, after the initial experiments, this project was scrapped as cloned human souls could not survive for more than 3 minutes, due to the enormous mental shock of realizing that they aren't "the original". The solution to use the souls of newborn children was created, as newborns have not yet learnt anything, so their souls can develop from scratch, without experiencing the shock that clones of aged human Fluctlights experience. Four people that worked on the Ocean Turtle were sent into an artificial world as parents to raise the Artificial Fluctlights and from these children a world started to develop that was called Underworld. As this world was monitored it was discovered that people in the world were unable to break any rules, and therefore were incapable of properly setting their priorities. Because of this, many people were sent into Underworld to start as newborns, but every time the subject would become an introvert, feeling as though something in the world was "off". Kirito was then selected as a candidate, due to the fact that he is used to the sensations of being within a VR world, and was sent in to live a life and provide information as to why people in this world could not disobey the "Taboo Index."

Features
The Soul Translator accelerates the time perception of the person that is using it up to 10,000 times, allowing the person to experience years of life in a matter of just hours. Though there is a limit on how much time a person can spend in accelerated time, or else they will use up their soul's lifespan, which is estimated to be about 150 years.