I've got a question:

Do dragons of Rivellon have their own culture(s) ?

I'd suggest so; it would make the game far more interesting ...

Even social groups among the dragons could be possible ...

When you find a big kettle of crazy, it's best not to stir it.
--Dilbert cartoon

"Interplay.some zombiefied unlife thing going on there" - skavenhorde at RPGWatch