at divinity 1, when you become the divine, you have to meet a dragon, so he could teach you a skill..
that about it, just a black dragon that survived somthing and had a rest in the desert.
i would assume there is no dragon lore. just some beasts that do what they want. and the dragon slayers tend to kill the ones that make a mess.. till they meet a real dragon and die.
divinity 1 had wyrvn riders, evil peeps that hunted the marked ones, and in the desert they acted as plain trash mobs.
i bet that in divinity 2 the dragons will be shrinked into wyrvn size. because in divine 1 the black dragon was hugh.
i also dont like the way the hero turned into half dragon.. it looked like the intro of divinity 1 when the ghost entered the guy.. it's not original any more, for larian, and would seem like the game repeat itself.