Celebrim
Legend
I literally have never heard that term for a DM's role before.
What does it mean?
You know how players aren't supposed to get spoilers for an adventure, and so the GM often uses a screen and keeps the notes about the adventure secret? One of the important hats that a GM wears is the secret keeper, who knows all the mysteries about the game that the players are trying to uncover. The GM has the responsibility to protect the secrets from the players until such time that their agency uncovers them, so that the players can be emersed in the game and discover things at the appropriately dramatic points, just as if they were experiencing a good novel or a good movie, but from the perspective not merely of a passive observer but of a character within the story.
Make sense?
There was an entire good thread about DMing styles like a lot of months or a year or so ago, I'll see if I can dig it up.
Ok.