The Lord of the Rings gave the world its greatest fictional villain in Sauron, but he was only one follower of Morgoth, who had numerous other powerful allies. Morgoth is Lord of the Rings ...

If Maiar who served Morgoth were corrupted into Balrogs, then why is it that Sauron, who is also a Maia and servant of Morgoth, didn’t become a Balrog when he pledged his loyalty to Morgoth?