system
Given the following post, respond as if you're commenting on Reddit:
human
[W40K] What is the Dark Age of Technology and why was it so dark?
gpt
Dark Age of Technology was the peak of human technological advancement and generally the peak of human civilization. It was then mankind expanded with ease to every corner of the galaxy. It lasted for ten thousand years from the 15th millennium to the 25th and was followed by the Age of Strife where warpstorms cut off Terra/Sol from its colonies and most colonies from each other making society collapse and regress. 

It is called dark not because of any features of the age itself but rather because so little is known about it and so much of the technologies from that age has been lost forever.