Now, you are no ordinary God - you are one of the Celestial Incarnae, the greatest in the heavens. Your power and authority are raised to staggering heights, such that you could challenge any ten high-ranking Gods and triumph easily, and command any deity or other spirit in the Bureaucracy short of another Incarnae. Your Domains are further expanded as well, having an entire three primaries and six secondaries to start with, albeit with a catch: One of your primaries must be a celestial body or location (such as the sun, the stars, or the void between), another must be an open-ended and influential concept (such as perfection, life, or order), and your secondary Domains are limited to two per primary.
Your charms are now cosmic or conceptual in scale, for instance, if one of your domains is perfection, you can unleash charms that hit infinitely hard or absolutely invulnerable for a limited time etc, and if one of your domains is the stars/the sun, your charms can unleash supernovae, create stars, etc, and over time you will gain more domains and stronger charms
Note that a Solar Incarna will be stronger than a Luna Incarna and so on and so forth.
You also have one more bonus available to you: You now possess a unique magical material to call your own, such as the Unconquered Sun's Orichalcum, or Luna's Moonsilver. While its appearance and mystical properties are at least partially influenced by your own nature and Domains, you may otherwise freely customize the specifics of your material within reason, and hold the knowledge of how to create and work with your material.