Taking this further these modules also state that highly devote clerics of the Issori god could become facets and choose what aspect they represented. The other clerics were not sure how this happened. The Issori claimed that they could worship these facets for limited power the same way that worshiping their God granted but weaker.
I wonder (and leave you to wonder as well) if the Issori facets are the same thing as Valinor.
Perhaps there is something the First City that allows someone to become an Issori facet or human Valinor. Something that both the Ssethrics and Elorii never found.
If we look at Valinor. They are each an aspect of a god. This thread has an incomplete list.
http://forums.paradigmconcepts.com/viewtopic.php?f=27&t=730Now some material states that the Gods came to Arcanis with their men, and Valinor. But there are no stories of specific Valinor during that time. There are vague mentions of Valinor attacking Belestor. But Valinor aren't really named until the Dragon's War. This is after humans took Belestor from the Elorii.
From the old campaign Manetas had worshipers and granted them power. Specifically they counted as a different church for the sake of Smite Infidel. And He could curse those that defiled his Holy places.
Also from the old campaign The Year of Ill Harvest a human extracts an organ from a Valinor, implants it into himself and slowly begins to change into a Valinor (or Valinor-like) as well.
Finally in "the Page" from the Black Book of Ymandragore it documents the Sorcerer King successfully implanting the organ in himself. And I don't think anyone would argue that the SK is a powerful being.