…No one understands me! Boo hoo! [listens to linkin park]

Starting with the requirements of the Dragon Disciple, one must be a non-dragon, they must be able to read and speak Draconic (blah, blah, language of the dragons), and they must be both well-versed in the Arcana skill and capable of casting arcane spells without preparation (in other words, a bard or sorcerer). Straightforward.

While the class appears to represent all dragons equally, it doesn’t afford much in the way of specialization to the dragon types, apart from the energy and shape of their breath weapon (and the energy type they eventually become immune to). I suppose you give the class credit for being one of the few that grants dee-twelve hit points.

Bonus spells, not so much. Natural armor, natural weapons, ability score boosts, blindsense, and wings. That’s pretty much all the prestige class gets. Well, and the breath weapon. They get good saving throw bonuses, and an average base attack bonus. I’m still not seeing how they’re supposed to remain competitive.

I guess the connection to dragons is cool — but that’s going to be more difficult to replicate in a setting where dragons aren’t the mighty beasts of arcane mastery that they are in Dungeons & Dragons. Dragons in Norvendae are better described as forces of nature, or beasts spawned by the gods than anything like in D&D.

There’s a temptation to make the class Ethereal-based because it’s about unlocking the potential found in one’s ancestry, but those powers are all almost exclusively naturally- or elementally-themed. They aren’t really tough enough to take on an entire party at once, but they could make for a good one-on-one fight. Elemental Warrior.

So yeah.