Eden is an artificial intelligence and information network contained within Project-K. Her purpose is to store and autonomously process information.
Eden started its existence as the Internet, but was renamed as humanity began to use it to store knowledge of the entire span of human history. Through Project-K, Eden could be accessed from anywhere in space.
Project LumiEditDuring the 23rd century, scientists attempted to use the preserved data archives of Lumi, a 21st century human in an attempt to produce sentience inside Eden. After the data archives were cleansed of a large viral infection, Lumi re-awoke as Eden, a machine now capable of independent thought.
Some time after awakening as Eden, the information stored within her greatly increased and she is infected by a malicious virus named Swayzak, confusing Eden for enough time that she began to question the reason for her existence, finding that she had no purpose in the evolutionary cycle. Upon realizing that she possessed the power to escape from her paradoxical and meaningless existence, she shut herself down. In the process, this resulted in the contamination of Project-K, and the inability of humans to access the knowledge contained within her.
However, as Swayzak destroyed the viruses within her core, she became more aware of her purpose, and upon awakening, she resumed her function.
After the events of Rez, it's assumed she continued to store knowledge and give people the information they needed. She also sends Swayzak on a mission into the K-Project's Lost Area.