who made the nano virus in stargate atlantis
Ancient (Stargate) The Ancients were able to hold the Wraith back with their superior weapons for a hundred years, until they were forced to submerge the city and to leave the Galaxy, for no matter how long they stalled the destruction of Atlantis, the Lanteans were unable to overcome the endless number of Wraith.[4] They started to make more desperate experiments, such as Project Arcturus, a failed attempt to draw Zero Point Energy from their own universe, instead of from within an artificially created region of subspace as in Zero Point Modules. However, containing zero point energy in our own space-time caused serious containment issues, killing the Ancients and the people of Doranda, the planet it was based on.[15] They also developed nanites designed to fight the Wraith on a cellular level, giving them aggression codes surpassing that of the Wraith. The nanites took human form, becoming a race known as the Asurans. They begged to have the aggressive nature removed from their programming, but the Ancients refused. Once it became clear the Asurans would never be the weapon the Ancients hoped for, they were subsequently exterminated by the Ancients. Not wanting anyone to find out their mistakes, the Ancients deleted all references to the Asurans in the Atlantis database, save for the gate address. A few of the nanites survived and brought up a second evolution, re-creating Asuran society.[16] It is believed that at one point in time the Asurans even created several nano-viruses specifically designed to kill humans, so as to deprive the Wraith of a food supply. One such virus, which causes hallucinations and death caused by a brain aneurysm, was encountered in a lab on Atlantis. Janus, an Ancient scientist, also built a device called the Attero device, which emitted a specific frequency of subspace distortion, causing Wraith ships to explode when attempting to enter hyper-space. It was later shut off and ordered to be destroyed (an order Janus, as usual of him, disregarded), because the same frequency which damaged the Wraith ships also caused an explosive overload in active Stargates.