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Given the following post, respond as if you're commenting on Reddit:
human
[Lord of the Rings] What power and from who is Gandalf summoning before his fight with the Balrog.

He mentions being the protector of the fire or something. What does he say exactly and what is he envoking?
gpt
>"You cannot pass," he said. The orcs stood still, and a dead silence fell. "I am a servant of the Secret Fire, wielder of the flame of Anor. You cannot pass. The dark fire will not avail you, flame of Udûn. Go back to the Shadow! You cannot pass."

The Secret Fire is Eru Iluvatar, the god of Arda, the world in which LotR takes place. Gandalf is telling the Balrog, in terms it (but not the fellowship) will understand, that he is an emissary of the Valar and that it had best step off if it knows what's good for it.

The Balrog does not know what's good for it.