"Common Sense" approach to rules (RACSD)

[Tar Palantir]

I feel like you totally missed my point on HD as well, but, since I really don't have anything more I can add to that, I'll just let it stand.

Hit Dice is the general term covering both racial hit dice and those gained from class levels. Epic dragon advancement just says "Hit Dice", the generic term, not racial hit dice, as it probably should.