looking for a story where the CMC visit the old castle mess with magic and fuse into an alicorn losing their identities in the process
as usual, can't remember the title.

Is... this what you're talking about? https://www.fimfiction.net/story/200305/cutie-mark-crusadicorn

how about this one ?

EEquestrian Princess- Three Thirds

• MLP: FiM
• Slice of Life

The Cutie Mark Crusaders, after succesfully helping Diamond Tiara understand herself and the value of friendship, suddenlly find themselves in a strange void... And is that Princess Celestia?

• Alt. Universe
• Celestia
• Main 6
• CMCs

Kind of Brony · 15k words  ·  450  23 · 7.9k views

7359035
no, it has this image on it