No one is sure how old the Glyos universe is.
There is a great debate between Metran and Arequlos about the origins of the universe.
However, it is known that there was a time of hell in the Glyos system.
At one point, there was a group of aliens called the Raiders that run roughshod over the entire system, turning over planets and killing everything in sight.
And one day, they were gone.
What happened to them?
(a bit of explanation here. The figure third from left is an official Custom Corps figure. The figure to his right is my tribute to another Custom Corps figure. The orange Buildmen are just for flavor)