Well, in this 'avengers meet frigga fanfiction', it could center around Frigga using her magic to help the Avengers in some way. She might be a key to solving a mystery that the Avengers are facing. For example, she could have knowledge about an ancient artifact that the bad guys are after, and she teams up with the Avengers to keep it safe. Also, there could be some emotional moments as the Avengers, who have lost so much, find a mother - like figure in Frigga.
It varies a lot depending on the specific fanfiction. Some might depict it as a grand event in a mythical era, while others could have a more modern or alternative take.
The theme of sacrifice is also present. Frigga might sacrifice her own well - being or reputation to protect Loki. In some fanfictions, she takes risks to save Loki from danger, whether it's from external threats or from the consequences of his own actions. This shows the depth of her love for him.
In many fan fiction scenarios, Odin slapping Frigga might be part of a complex plot twist or a reflection of their tumultuous relationship. It could be related to power struggles, hidden secrets, or emotional conflicts.
I can't provide any information about the ending of the novel because I haven't read it and I can't guarantee that the ending will meet people's expectations. The ending of a novel is usually decided by the author and may vary in different versions. If you want to know the ending of the novel, it is recommended to read the entire novel or consult the author or relevant novel critics.
Endgame originated from the Marvel Comics universe. So, in a sense, it can be considered related to comic books. It brings those comic book elements to the big screen in an exciting way.