Age of Despair
The most powerful Dragon Highlord, self-styled Emperor of Ansalon
Remember that he is also Zeboim’s consort, and fathers Ariakan with her, who founds the Knights of Takhisis later during the Age of Mortals.
Lord Ariakas, neutral evil elderitch knight 19th, CR 10
AC 18 (2 unholy ogre greatsword) 1d6 cold, fire, lightning, poison, acid alternating)
Crown of Power: advantage on all Charisma checks
Tombfire/Harkiel, chaotic evil adult red dragon