Well, it seems to draw inspiration from real-life situations, but it's likely embellished and dramatized for entertainment purposes. So, it's not a purely true story.
I'm not entirely sure as it could be about various things. It might be a story centered around a 'dark Excalibur', perhaps a corrupted or mysterious version of the legendary sword. Maybe it involves characters who are on a quest related to this dark Excalibur, with elements of adventure, mystery and fantasy.
One possible fanfiction could involve Shirou being transferred to the Highschool DxD world and somehow obtaining Excalibur. Maybe he has to use it to defend the school from a new threat that the regular characters can't handle on their own. This would lead to some interesting interactions between Shirou's abilities and the magic and powers in the Highschool DxD universe.
Excalibur is extremely significant. It was given to Arthur by the Lady of the Lake. It is a magical sword that gives Arthur an edge in battles. It also symbolizes his legitimacy as king. Without it, Arthur would not be the same powerful and just ruler that he is in the story.
Excalibur is a very unique character in Soul Eater. He is a powerful weapon. His life story involves a long history of being passed down. He has an over - the - top personality, often being very self - centered and full of pride. He has been involved in many battles and adventures throughout the Soul Eater world, often causing chaos and amusement with his antics.