The origin and nature of Blue Fusion Reactors is never fully revealed, but they are rumored to be reverse-engineered from alien technology (much like the Grays and B13 Antimatter Reactors). In official documents, they are referred to as an "artifact", and given the codename ROS172-E (ROS may stand for Roswell.) They are likely very expensive to build and maintain, as they are only seen in Sector 4 of Area 51.
Blue Fusion Reactors are relatively small, being comparable in size to a human. Most of that size is devoted to the Isotope Reservoir. Even for their size, the reactors generate enormous amounts of energy; they are capable of supporting a plasma field around Bob Page, powering the Nanotech Infusion Chamber, and powering 3 different Universal Constructors at the same time. Fusion Reactors cannot be destroyed physically, with either the Dragon's Tooth Sword or explosives.
- As part of the Illuminati ending of Deus Ex, JC Denton must disable the Blue Fusion Reactors. Every device has a numpad which is locked with the code 7243. Once all 4 reactors are shut off, JC can hit the Infusion Control Switch, which will destroy the Infusion chamber in a violent explosion that kills Bob Page.