Not sure if i have to ask you but is Voaraghamanthar supposed to be an Adult Black Dragon or an Ancient Black Dragon? i am asking this because they have been refered to as both as an Ancient in Storm King’s Thunder and as an Adult in Hoard of the Dragon Queen. Ancient.
The rule is: newer source overrides/corrects/updates the older source.
Obviously, between the two books, someone was brave/foolish enough to get close enough to "Old Voar" to ascertain age a little better. And survive.#Realmslore
— Ed Greenwood (@TheEdVerse) February 15, 2021