That's quite specific.

[It doesn't tell much exactly, sure, but knowing that it's a the spirit of disharmony and that it's named Discord it doesn't take much to think of the different effects it could have had in Celestia's world.]

So in your world even disharmony has a spirit. In my world it doesn't, there's nothing, person, spirit or magical being, responsible for it or that instigates it as far as I know. It just forms part of people's nature unfortunately.