2 Works in Neltharaku (Warcraft)
Sabellian, the elder son of Deathwing left abandoned with the rest of his brood in the unforgiving Blade's Edge Mountains, and Wrathion, who thinks himself to be the last Black dragon left, learn of each other's continued existences worlds away, resulting in a violent struggle with consequences that are left unchecked. [UPDATING ON OCTOBER 1ST due to BFA drop]
A ally appears after his final breath to aid the Netherwing Dragonflight in being accepted by the rest of the Wyrmrest Accord. But for that to happen, they'll need an Aspect. Spoilers for Twilight of the Aspects.