On this image, Celestia holds potency.
Now, let's jump to another matter entirely:
In a good fic of MLP that is very often -and rightly- compared to a Michael Bay movie1, Twilight is constantly in a struggle about her own capacity to damage others or, as the fic itself calls it “The Power to Destroy”. This isn't the central theme of the fic, but it's close to it and a good deal of Twilight's development is about accepting that she has it and protecting those she loves with it. The power to destroy is a very common theme in nearly every modern story, even if most of the time it isn't carried beyond “Hey dude I can make th