system
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human
[Lord of the Rings] What was Sauron's endgame? 

So say Sauron got the ring, conquered Gondor, Rohan, etc. Say he won everything there was to be contested. Then what? Would Sauron have commanded the Orcs to build spaceships and start invading other worlds? Waged war on some higher plane, perhaps? Yes, I just recently watched the trilogy again.
gpt
At the end of the First Age Sauron was offered a chance at redemption.  He would have to prostrate himself in front of the Valar and perform some sort of penance.   He was too proud to bear the shame and hid on middle earth.  While its impossible to fully know his mind.  His goal appears to be that of his old master Morgoth...  To stand apart from the Valar and their lord, to be free of their influence, and to shape the world according to his own desires.   Sauron being of a lesser order cannot hope to truly shape middle earth in the same way that Morgoth was able to, but what he can do is reverse the out come of the War of Wrath, to stand apart and rule unchallenged by the Valar or Mortals...  Some might say... to be free.