gandalf mentions the blue wizards

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Maybe he wants to pass on knowledge or history. Gandalf is full of wisdom and stories are a great way to share it.

I'm not sure which specific story Gandalf is telling as there are many in the Tolkien's works. Maybe it's about the history of Middle - earth, like the battles against the dark forces or the tales of the rings.

It's hard to say. Gandalf has a lot of raw power and experience. He's faced some really tough foes in Middle - earth. But Harry Potter is no slouch either. He's got his own set of powerful spells and the ability to think on his feet. However, I think Gandalf might have the edge. His magic is more of an all - encompassing force, and he's had centuries to master it.

They could be a group of rogue wizards who have been exiled from their own magical society. These wizards might be desperate for power and see Nico as a means to get it.

Another concept is that Naruto is sent to Middle - earth. There, he could use his ninja skills and chakra powers. He and Gandalf could team up to fight Sauron. Naruto's ability to make friends and inspire others would be really useful in uniting the different races of Middle - earth against the common enemy.

Well, Gandalf is from the Ainur. He was among those Maiar who were sent to Middle - earth. His purpose was mainly to help the good against the forces of evil like Sauron. He was created long before the events in Middle - earth started to unfold. Gandalf's origin story is deeply intertwined with the greater cosmology of Tolkien's world. He had powers that were both magical and related to his wisdom and knowledge, which he used to influence the course of events in Middle - earth.

Gandalf originated from a higher spiritual plane. He was dispatched to Middle-earth with a purpose. His background involves being part of a divine order and having a responsibility to bring hope and resistance against evil.

You could try 'The Silmarillion'. It provides background and additional context related to Gandalf and the broader Tolkien universe.

Many novels would write about the author because the creation of a novel was usually determined by the author's imagination, experience, and skill. The author would usually express his worldview, outlook on life, and values in the novel, and add plot, characters, and clues to the work. Therefore, it was very normal to write about the author in a novel.