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Sestren is the main bad...THING (I can't say bad "guy" because we don't actually know Sestren's gender...
if it has one..) in the Panzer Dragoon world. No-one knows where it came from, nobody knows who made it, or if it made
itself. The only thing that is known about Sestren is that it's job is to keep the Towers running no matter what.
Sestren's "home" is the Astral Plane that exists between dimensions. The only way in is through a Tower. The only way out...
Is there a way out? We don't have any proof of that.
A couple of other pieces of information about Sestren slip out during the last battle of Panzer Dragoon Saga. It was Sestren that activated the Dark Dragon, Guardian Dragon
and Pandra, as well as the "Flying Tower", Shellcoof. They were all sent for one reason: to take out the Heresy Dragon, who seems to be the only thorn in Sestren's side.
We might as well face facts: nobody knows much about Sestren, probably not even Team Andromeda who made the bloomin' game. Heck, my explaination seems to be as good as explanation as any.