Slice of Life
None of the ghouls in Afterlife give Cerberus a second thought. The robot bartender's programming may be a bit odd, but his combat inhibitor means that everypony is safe despite his constant threats. They don't know how real his rage is, and why he hates ghouls so deeply. Not until two smoothcoats are finally able to coax the full story from him does Cerberus' unfortunate path and motivation come to light. As Spark Plug, Time Bomb and Cerberus chat over a few drinks, the robot's hatred becomes more and more pronounced.
A Fallout: Equestria sidestory based on Project Horizons by Somber based in turn off of Fallout: Equestria by KKat based in turn off of the worlds of both My Little Pony and Fallout, two great tastes that taste great together. This story is an exploration of a possible history of the character Cerberus from chapters 46 on. Rated Teen for naughty words and a bit of blood as well as some mature themes.
You don't need to know everything about Fallout: Equestria, but it helps. You do need to know that ghouls are undead ponies, a condition caused by radiation, and that most of them are not far from losing their mind and going Full Zombie.