There should be a lot of different dragon types, differentiated by size and color.
- Some smaller and ones manageable by mid to high level players by themselves.
- Some larger ones require high level players to defeat.
- Some even larger ones are hard to kill even foe ultra high level players, and require a few companions as well.
- And the king of them all, would require several nordic tribes to unite in order to be able to defeat him.
This one should be unique, and in general, level 3 dragons are bosses found rarely on their own, level 2 are mature ones found on specific places, but in a small chance, on general outdoor places as well, and the level 1 ones are more common than other types.