Were I GMing, if such a thing as demonic reprisal would be in the cards, during the night I'd have a dream - y'know, Desna's whole... thing... that warned of the possibility of retaliation and maybe gave a vague interpretive hint as to what to expect.
Vague enough that it's not helpful to accurately predict when (because dream-logic), but crunchy enough that they have some idea that it's coming and maybe even can put the pieces together about what (or who) they face.
as demons do not let go of their worshippers lightly.
... is very true, but they're also busy and chaotic - while certainly and entirely capable of long-term planning, "taking revenge 'cause a tribe of trogs" is rather easily lost in the face of things like, "prevent rival from axing me in the back" or "that battle that literally spans continents I was gonna do today."
As a result, I'd have a select, specific limit to how much any given demon is willing to "spend" on such a petty thing. Obviously the first wave would be the peons, the second would be slightly stronger, the third might get serious, and the fourth, if any, would be tough... but it would fit neatly into leveling up.
(As an aside, the PCs would also be killing more demons, which, you know, win/win.)
Now, this wouldn't count as a full on mythic rank accomplishment, and I know you like the hero point system better, but I could see this equate to a lesser mythic trial - maybe like a stepping stone on the way to "mythic" (whatever that means in your games).
As to the factions, the ever-vague religious faction is super useful for this sort of thing - it's important to remember, though, that it should be more of a rough guide, not-so-much "hard" rules - maybe something you even keep notes on in the background instead of them keeping track of their Prestige Awards (Total or Current).
But that's just me.
|The Vagrant Erudite|