They were taken to dark places where they were torured, and physically, and mentally broken so they became evil, deformed, worthless creatures. The dark lord could not create life of his own, so he ruined others lives and twisted them, so that they bacame evil.
Hope that helps
For some reason I've made a mistake someone with more Tolkien knowledge than me, correct me
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"One more soldier dies, and when he gets to Heaven, to St.Peter he will tell, one more soldier reporting for duty, I've served my time in Hell."
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