A book in which the protagonist has to transport a certain important object (e.g. A message, magical artifacts, . )?

Hey👋🏻
(Question is above)

Unfortunately, I can't think of a good example at the moment except "Letter for the King" (also a Netflix series).
So the main character has to go on a long and dangerous journey to bring something specific (e.g. An object) to another person / place.

I know this is very specific so if you know books that do not exactly match my idea, bring them on anyway!

Lord of the rings

Shadowwalker