Xantalos
Speaking of the Dragon Emperor, are Emperor Dragons a thing in your headcanon?
Yep! I'm too lazy to bother to look up the tabletop stats and try to work out how strong units are compared to each other in those stats and such so the change isn't exactly like the transition from star -> emperor on tabletop, but they're a thing.
In my headcanon, the difference between an Emperor dragon and a Star dragon is a matter of ... experience? Experience, momentous deeds performed, etc. Due to some things about dragons I'm not revealing, they're one of a few races that basically have an IC levelup mechanic, one of the others being Orks. You have your various dragon types - basic ones like the Asur work with, magma, black, carmine, shard, etc, and all of those progress along basic categories as they get older. Think of it kinda like how D&D dragons get stronger as they age, except for convenience I'm keeping it to three basic age categories: Juvenile, Adult, and Elder, or what the elves call Sun, Moon, and Star. There's variance in those classifications, for instance a dragon getting closer to being an Elder would be on average stronger than one that just became an adult a few centuries ago. While dragons are functionally immortal and never stop growing in power, they do tend to kinda suffer diminishing returns as they get older, so a century for an adult might be only a year's worth of growth for a juvenile. For the most part, dragons develop like that.
There are exceptions, though, the Emperor dragons you asked about. This is more like a boosted stage they reach when they either gain a shitload of experience from killing a whole crapton of things or do a bunch of really momentous deeds like killing something much stronger than them or diplomancing an entire nation or something. Has to do with [REDACTED] and [REDACTED]. Dragon Ogres have something similar with their Shaggoth classification. However, a dragon doesn't have to be an Elder to become an emperor-type, they can do it at any age. If they're a juvenile when they achieve it, they're referred to as a Prince Dragon. Adults are Kings, and then Elders are Emperors. Once a dragon achieves it, they basically keep it forever unless they go to sleep for like half a million years or something. It is generally more difficult to
go super-saiyan achieve the status the older a dragon is, since the required killcount or status of the deed they perform rises as they age. Shen Huanglong achieved it during the unification of Cathay - he was already an Elder at the time, but the significance of basically creating an entire country out of scratch plus breaking a few Chaos hordes pushed him over the edge.
Their capabilities as 'royal' dragons are basically boosted versions of their non-superdragon kin. They're faster, stronger for their size, quicker to react, their fire is hotter and they can sustain it for longer, far more durable than an otherwise equivalent dragon, etc. Don't underestimate the normal dragons, of course, they're still massively powerful, intelligent, and dangerous beasts. The difference between a Star Dragon and an Emperor Dragon is that the Star is an immensely powerful battlefield asset, one capable of letting allied armies outnumbered many times over win a battle by the sheer morale damage and leadership decapitation strikes it can pull off, while an Emperor can take on small armies on its lonesome and win. One is a powerful and feared creature, the other is a monster you usually only hear tell of in legends that you hope aren't true.
Huh, I went on a tangent again. Might as well threadmark this then.