A lot of things are harder than dragons lol
Unfortunately, dragons still have the most potential to fuck things up I don't mean you per-say, I mean your game. Everything from killing NPCs to taking the fight where you don't want it. Ultimately, they really are only weak when their doing a stationary attack or on the ground; dragons are the most dangerous creatures in skyrim when they're doing nothing but low-altitude bombing runs . They're the prickly pears of Skyrim: They hurt if you don't engage them carefully but they are yummy when you get inside them :3
Higher-level Charuses?... FUCK THOSE GUYS!