For you maybe a Breathalyzer Dragon maybe, sounds tough right
Im ok now no need for tougher enemies, just fought an Elder Dragon it was owning me, plus was in a ruin and this fucking Draugr Deathlord with its ebony bow and arrows basically left just a sliver of health with every shot it took. Maybe because my enchanting isnt as high and smithing is still mid lvl.
Would have liked to see vastly different dragons. Like maybe a 2 headed one, ghost dragons, WereDragons or Vampire Dragons lol. Instead of them all looking similar really.