Which race-class combination was added in Dragonflight?

Dragonflight added the Dracthyr Evoker as a new race-class combination. Dracthyr are the playable dragonkin race, while Evoker is the class they use.

The pairing is unusually exclusive in World of Warcraft: when introduced, Evokers could be played only by Dracthyr, and Dracthyr could choose only the Evoker class. Evokers wield the powers of the five dragonflights and wear mail armor. Their original specializations were Devastation for ranged damage and Preservation for healing; Augmentation was added later as a support-oriented specialization.

Dragonflight also gave Dracthyr a unique starting experience in the Forbidden Reach and allowed them to join either the Alliance or the Horde. The other choices are existing combinations rather than Dragonflight’s signature addition: Void Elf Priest, Worgen Druid, and Pandaren Monk were already possible before the expansion. Dracthyr Evoker therefore identifies both the new race and its defining class.