Clear Skies is a player-made movie trilogy that has been canonized in-universe as a movie series, a fictional adventure story - told out in the description for the special edition item:
Premier ticket for: Clear Skies
Clear Skies is a three part story created by director John Rourke.
Upon the initial release of Clear Skies on May 29, 2008 John Rourke had this to say: “Two years of my hard work culminated in this, I’m very proud of it and I hope you like it.”
A year later New Eden was graced with the release of Clear Skies 2 on May 10, 2009. It would be another two years until finally, Clear Skies 3, was released on May 29, 2011; 3 years to the day from when the first Clear Skies was released.
Unfortunately for those wanting more Clear Skies John Rourke announced that Clear Skies 3 would be the last and final film in the series.
I believe the Trigs to be a splinter of the Jove race, but nothing so direct as having come from the faded Third Empire. The Directorate was a shadow of the Second Empire, which itself seems to have likely been the origin point leading to the Drifters, Triglavians, and Directorate of today - all very different factions.
I go into great detail on the evidence behind a lot of this (and the theories I continue to develop) in this thread: [Speculation] Theorizing the entangled past and future of the Triglavians and Drifters