system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happened to Gandalf the Grey in Fellowship of the Ring? Why did he come back as Gandalf the White?

I was really thinking about this today. Sorry if i got the names wrong, i don't know much about it.
gpt
He killed the Balrog, and died in the act of doing so. He left the World, and was sent back by Eru Iluvatar (God) with enhanced power and authority. The Elves of Lorien, recognizing his newly-enhanced authority, clothed him in white and gave him a white ash staff, and called him Gandalf the White to symbolize his taking the head of the Wizard's Order from Saruman, formerly called the White but now calling himself Saruman of Many Colors.