This is a tough one! Good almost always prevails over evil, but who doesn't love a great villain mwahaha.... Some attacks for DA could be shadow beam or night fury? Yes I've seen how to train your dragon, no correlation lol. Angel maybe Harmony (a sound based attack, like angels singing heavenly praises etc...) or Soul bomb, where all dragons of the realm would give a tiny bit of its life energy to collectively make a huge bomb. Just some ideas hope you liked some of them