Title: Sógh
Author: lawgoddess
Rating: R
Word Count: 72243
Pairings: Merlin/Arthur
Author's Note: based on a wonderful prompt from Gilli_ann, quoted in the story.
Summary: Merlin becomes addicted to a magical potion and there are terrible consequences for him and those he loves.
Link to fic on AO3:
https://archiveofourown.org/works/13006485