How does the Avatar spell function if my character worships a god that isn't listed under the spell?

Question

I'm about to start a 3rd level campaign centered around upper-class intrigue and pirates, so I figured I'd try playing a Cleric of Ng to fit a setting with implicitly ambiguous morals. However, I'm looking both online and in the physical copy I have of Lost Omens: Gods and Magic and cannot find any mention of what additional benefits you gain for casting the Avatar spell while worshiping this god and its contemporaries in the Eldest Pantheon.

I was ecstatic when I discovered that Grundinnar (the first God I played a Cleric of back in PF1e) was included as a part of the Dwarven Pantheon, but he's in the same boat as the Eldest since the Avatar spell does not specify either Grundinnar directly or the Dwarven Pantheon in general.

So my question is If a Cleric casts the Avatar Spell and their Deity isn't listed under its effect, what happens?

Answer 1

Additional details for casting Avatar for different deities other than the core deities in the CRB are found in Lost Omens: Gods and Magic. However, I don't believe either Ng or Gundinnar are listed in that level of detail.

Neither receives the same treatment that core deities do (a full page-spread), but both have a listing in the appendix that provides mechanics for a variety of purposes: cleric spells and domains, divine skills and abilities, etc. The details of casting Avatar for worshipers of those deities are not described.

Without that level of detail, it's up to your GM to decide what the effects are. They may homebrew some specific bonuses related to your deity, copy one of the existing sets from another deity, or ignore deity-specific bonuses altogether (though that would weaken the spell in our case).