Despite Sombra’s demise, hundreds of crystal ponies remain 'Uncrystallised' and nopony knows why. But Twilight is determined to find out the reason. And after days of searching, she finds a hidden dungeon in the outskirts of the empire. She gathers her friends to investigate
Cover art by Rokuro-sama
I was told about this one by Rokuro, I will check it out later :D
7033667 How nice! I am looking forward to hearing your impression