Series title: Phantomverse
Author: Aleteia
Genre: HTTYD Fanfiction
Source/where to read: AO3 archiveofourown.org
Rating: ⭐️⭐️⭐️⭐️⭐️
Status: Ongoing (slow updates)
Accessibility: Free

First fic title: The Phantom of the Arena
Status: Complete

Second fic (short story) title: The Last Snoggletog
Status: Complete

Third fic title (sequel to The Phantom of the Arena): The Phantom of the Archipelago
Status: Ongoing (slow updates)

I think this is probably BY FAR my favorite httyd fanfiction series I've read till this day. I have yet to read anything else that is THIS amazing. This series is an absolute masterpiece and the author is just so incredibly gifted. I love this series so much. I would definitely recommend this to any httyd fan (or any phantom of the opera fan!)