This episode deals with the heavy emotional aftermath of Colonel Maes Hughes' murder. While the brothers were away, Hughes discovered the nationwide transmutation circle conspiracy and was killed by the homunculus Envy [3].
To cover their tracks, the military (manipulated by the homunculi) frames Second Lieutenant Maria Ross for Hughes' murder. The story takes a dark turn as Colonel Roy Mustang appears to take justice into his own hands, leading to a "confrontation" where he seemingly incinerates her beyond recognition [2, 4].
The story follows the Elric brothers as they return to Central Command, only to be confronted by deep conspiracies and personal loss.
"fmab_018.mp4" refers to , titled "The Arrogant Palm of a Small Human." In the context of "internet stories" or creepypastas, it is often associated with the tragic and disturbing events of that specific episode rather than a fictional haunting of the file itself. Story Summary: The Events of Episode 18
People often search for "fmab_018.mp4" because it marks a major in the series. It transitions from an adventure story into a dark political thriller involving government-sanctioned murder and human experimentation [2].
If you are referring to a specific (a "lost episode" style story) involving this filename, these are typically fan-made horror stories that use the already disturbing imagery of the show—like the "Human Chimera" or the "Gate of Truth"—to create a narrative about a "cursed" video file that causes psychological distress to the viewer.
