Board Thread:Manga/@comment-26495049-20161020222547

I guess before chapter 86 was released,  we've all assumed   that Titans were a product of some sort of (failed?)experiment, due to the only known way Titans were created, which is via serum which comes in the form of an injection. Now we are told that Titans were created by some sort of pact Ymir Fritz made with the "devil", which implies some sort of supernatural origin for the Titans.

So which is right? Could this mean that there is some sort of higher power in the AoT world? Or could the "devil's pact" explanation be just part of Mare propaganda to make themselves look like the good guys?  