Quote Originally Posted by MandibleBones View Post
I'd kind of wonder why a white dragon is in the middle of the desert, honestly. You might be better served to switch out with the blue from the Fane (making Azurr Kul's daddy a white dragon and descaling the blue for the Ghostlord area). As for the second, as long as you match the metallics appropriately to their chromatic counterparts (CR-wise), I don't know that the secondary breath weapon is a game-breaker.
It isn't like he would be there without orders. As for the breath weapons, the Cone of Sleep/Paralysis could make for a TPK fairly easily (the Dread Necromancer isn't undead, and the party's saves are a bit low).