Nameless is difficult but Midir is much scarier. That being said, it's definitely the best dragon fight in the series, and it's difficulty matches the image of a dragon recruited by the lords to fight the dark. It's gigantic healthbar, it constantly flying or stampeding through the arena, and that you have to hit it's head for acceptable damage makes this fight an endurance fight, which can be incredibly tiring when you're most likely incredibly focused at dodging his large attacks. Although many of it's attacks are very telegraphed, they can still very much catch you by surprise, and demolish your health, and even one-shot you if you're more of glass-canon type build.
