World of Warcraft has always been good when it came to integrating new features into old content, and Nefarian in Blackwing Lair has quite a few choice words for his father's recently-awoken experiments. The Dracthyr and Deathwing are inextricably linked, and they have had to reconcile the evil deeds of their sire and general against the memory of Neltharion they were holding onto. Though Dracthyr can only be Evokers in Dragonflight, Blizzard still wanted to make sure that this new race and class could interact with the older parts of the game as seamlessly as any other.