For years, J.K. Rowling has kept much of the information regarding the creation of horcruxes a secret.
Today, Reddit user sirlionel13 offered up the explanation that the final, and most horrible act in the creation of a horcrux, is cannibalism.
The whole thing is pretty in-depth, and actually makes a lot of sense.
J.K. Rowling has not revealed much information about Horcruxes, though in an interview on PotterCast, she told us that her editor threw up when told the exact process.
Even if it isn't a verified theory (yet), it might be the most probable one we've seen so far.
You can read the whole theory here.