There are a total of 9 dragons.
1. Ashra - the primordial dragon of Order
Her dark side is worshipped by necromancers (Erathia Valley)
2. Urgash - the primordial dragon of Chaos
He is worshipped by demons
3. Arkat - the dragon of fire
He is worshipped by gnomes (Greenheim)
4. Silat - the dragon of air
He used to be worshipped by humans.
5. Shalassa - the dragon of water
6. Silanna - the dragon of earth
She is worshipped by elves (Irollan)
7. Sar-Ilam - a dragon who was once a mage and became a dragon himself.
He is worshipped by mages (Silver Cities)
8. Elrath - the dragon of light
He is worshipped by humans
The Faceless.
Malassa - the dragon of darkness
She is worshipped by dark elves (Eagle-Shyol)