Sin Eater (The) by Jane Mortimer

Sin Eater cover

8,500 Words

Sin Eater cover

Scully disappears into a mysterious vortex and Mulder makes an unbelievable sacrifice.

There is a touch of Dreamland foreshadowing with this evocative, classic MSR fic, written in 1996.  It's only rated PG-13 but still gives quite the mental stimulation. 🙂