Spoilers: Exile, the Black Fortress, and the Forge pack; no campaign ending.

Exile at Astragoth's hands
The 21 March 2023 introduction calls Drazhoath a Sorcerer-Prophet of Hashut, Lord of the Black Fortress, and master of the Legion of Azgorh. His mastery of magic and of engineering grew in exile, at the hands of Astragoth. The ambition attached to that education is a return to Zharr-Naggrund. Astragoth remains the High Priest. Drazhoath is the lord the capital sent away, who learned the craft and still wants the seat.
Forge of the Chaos Dwarfs arrives with Update 3.0 on 13 April 2023. The pack unlocks Astragoth, Drazhoath, Zhatan, and the hero Gorduz Backstabber together. Ownership is the same storefront as Immortal Empires access. The Realm of Chaos campaign for the race is the Great Drill of Hashut. It is not the race for Ursun. Immortal Empires is the sandbox, with the industrial tools intact: Labour, outposts, the Hell-Forge, convoys, and the Tower of Zharr.
Axe, sorcery, and Cinderbreath
In battle he fights with axe and sorcery. He can stay on foot or ride the Bale Taurus Cinderbreath. The mount changes how he reaches a fight. It does not change the army underneath him. Infernal Guard are the armoured line, and the Black Fortress is the place the roster ties them to. K'daai Fireborn are the bound assault. Guns still need a lane that the bull and the taurus have not blocked.
Zhatan, unlocked by the same pack, is the melee commander of the Tower and the servant of Ghorth the Cruel. Ghorth is not a playable lord. The three Legendary Lords share a race and split the job: Astragoth's Conclave Influence, Drazhoath's exile and the fortress, Zhatan's labour and the Tower. A player who captures Zharr-Naggrund has finished a sandbox war. The introduction's desire to return is the motive, not a scripted result.
Drazhoath the Ashen: gameplay and availability · More character stories
Sources
- Introducing Drazhoath the Ashen — totalwar.com
- Forge of the Chaos Dwarfs — support.sega.com