There are people who make stories where Discord is slain by different things. What most don't realize is that he is most probably not a living creature made of matter, but a incarnation of something that just exists in our perception of reality. And he will keep existing as long as there is something that can percept something else as chaos. Or with more simple, but less understood words, he is the spirit of chaos.
This is really really impressive! You took the goofy character from the show and turned it into what he was really meant to be-- an unpredictable embodiment of pure chaos and evil. Judging from the frightened reactions of the other commenters, I'd say you portrayed his nature perfectly. This is awesome!!