Black Dragonflight

Black Dragonflight are villainous and hostile dragon who get corrupted by influence of the Old God's Under Deathwing's leadership their goal is eradication all mortals from Azeroth.

In Cataclysm almost all species was annihilated with Wrathion only uncorrupted as leader after Deathwing's demise and Sabellian who actually resident in Outland with few baby dragons