As I said, its based upon their own flaws, not the elements. Twilight is special, her element from the start isnt a trait like the others is, magic is a force and with it you can do charms or curses. And Twilight certainly proved that she was able to do dark magic.
No, I think i saw this coming. (Being that the theme was the seven deadly sins + curses) What i didn't expect was your design for the changeling version of Rainbow dash. This is good and your style is very unique. I praise you on a great piece.
Cool! Do you take requests? I'd like to see a Changeling Spitfire! ( I'm friends with an "ask-Spitfire" account's admin, and she just made a Queen Chrysalis account, Spitfire is my ponysona's marefriend, and Chrysalis took her place, I mentioned a Changeling Spitfire to her, she loved the idea! )