“The belief or theory that the human race can evolve beyond its current physical and mental limitations, especially by means of science and technology.”
Imagine a world where death is meaningless. Where the end of the body only means a new shell for the mind. Where a human mind could experience centuries of life in several vessels.
Whenever a peak is reached there is certain to be a steady decline. This came in the form of the titans. An AI security system that went rogue, and decimated the Human race more than we had already done ourselves. Then they vanished as quickly as they had arrived. Ten begun to years later, humanity has started to rebuild from the ashes.
Welcome to the Eclipse Phase.