re: I'll ask this on this board: LOTR, Saruman

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I’m not very well-versed on the lore, but Gandalf returned as Gandalf the White after sacrificing himself for the fellowship. Seems like he came back more pure and "beautiful" based on his actions.

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Gandalf basically had a rebirth/reincarnation and when he came back he had his full power. More wisdom. More control over elements like light and fire. He was now the leader of the Istari, as Saruman was previously. He came back white because wizards are ranked basd off their power, white being the most powerful. Power came with that rank.

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Would Saruman return more monstrous? Say like a "Saruman the Orc"?

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I think answering this answers the OP's question. Gandalf was sent back by either Eru (who is basically God) or the Valar to finish his task. That tells me they didn't have to send him back. So I'm sure when Saruman died either Eru or the Valar had the option of what to do with him just like they did Gandalf. There would be no reason for them to keep him in a state or position to have any influence or ever grow in power again.