Welcome to the forum, Sierahk!
As far as I know in the game can be found these dragons:
(It MAY contains spoilers)
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1) Firkraag
2)Shadow Dragon
3) Silver Dragon
4) Green (or black?) Dragon near Suldanessellar
5) Dragon in the Nine Hells
Among them only the green one needed to be killed; silver dragon and dragon in Hell shouldn/t be killed by good characters.
No more dragons in the game, sorry
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Tanda,
with best regards from Guild of Assassins