Is the Dawnbreaker a lv'ed item? I just got it and it does as much damage as my Legendary Drawven Sword (100 Smithing, no pots), including the +10 fire damage. I'm fine with the damage, as I'm nerfing myself to hell to make the game more enjoyable, just curious is all.
And how do Ancient dragons differ in looks when compared to Elders?
Dawnbreaker is nit leveled and can be improved. However it is not related to a perk, so you need an effective skill of some thing like 140 to make it legendary. So you'll need smithing gear, potions or both. Oh and that sword is badass.
I'm also nerfing myself for more challenge, hence my difficulty with AD's. I started the Mq very late on life, first random dragon I saw was an elder. I've found Ancients to be more difficult then Alduin, who I fought at 53 and 58. Mjoll in her legendary Falmer armor is thee only thing standing between me and fiery death and they drop her with with a sustained breath attack.