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Random question, could the triarch organization (praetorians, not the ruling body) take over a tomb world and use its forces to expand their reach (a overload and court go against the law and he is deposed of and holdings confiscated)?

That's pretty much the purpose of the Praetorians, I would say "yes".

That's like... their exact role in life, almost word for word.

I guess I always assumed they just brought things back under control then appointed a new overlord instead of adding the tomb world's resources under their control.

In order for there to be a new Overlord, there would have to be a suitable personality in the Tomb's systems. Say, a member of the Court or perhaps a Cryptek, with the requisite skills and abilities. Otherwise? There's only mindless Warriors and such, which don't have the mental faculties to lead a Tomb.