FATE: Target of Grand Master

(This is a Fate/Type-Moon fanfic, encompassing worldviews from FGO, FSN, FZ, FSR, FE, etc., limited to the Type-Moon universe and original worlds based on Type-Moon settings. Some fan-created content may be included. Want to see heavily modified storylines based on the original works? Want to witness the Servants' love triangles between battles? This book has it all! Multiple heroines, but Morgana is the main heroine; please do not inquire if you mind this.)
A familiar piece of music started playing, and Xia Yan, who was playing FGO, was taken to a void space by BB. Here, Xia Yan learned that if he wanted to survive, he had to go through trials and become a Grand Master.
The good news is that Xia Yan is not the only one who has encountered such a situation; BB has dragged everyone in the world into the trial.
The bad news is that there are only seven spots for Grand Masters, and Xia Yan will face competition for 7 to 80 billion.
Current progress:
Completed:
Dungeon 1: The Hundred Years' War of the Evil Dragon
Dungeon 2: FSN Three-Line Fusion Mutation Version
Dungeon 3: The Final Battle Across the Four Seas
Dungeon 4: FSR Mutation Version
Dungeon 5: The Great War of North American Myths
Dungeon 6: Crane's Idol's Gratitude
Instance 7: The Sacred Round Table
Dungeon 8: Pseudo-FE Battle Royale
Dungeon 9: Absolute Warcraft Front
Dungeon 10: Critical Prosperity City + City of Moral Desire
in progress:
Dungeon 11: The Empire of Permafrost