Glorantha is one of the most influential settings in the history of rpgs. In a nutshell, in Glorantha it is possible to take advantage of mythic resonance to:
a) run vision quests on a mystical "Hero Plane" where questers follow a well-established script playing the role of some legendary heroes, and return from the quest with actual, appropriate abilities or items.
b) change the nature of gods themselves - or even "build" gods - through appropriate symbolic actions. In Glorantha's second age, a group of sorcerers known as the God Learners broke the world in this way.
Now, RoP:F seems to have been significantly influenced by Glorantha. a) is perfectly covered by Elysian and Eudokian stories. b) is perfectly covered by how Faeries, including Faerie gods, can be reshaped by human creativity.
I was wondering ... are there canon or fan examples of mystical groups (covenants, societates, or simply factions of knowledgeable mundanes) focusing these activities? Note that with "these activities" I do not mean devoted worship of Faerie gods. Rather, I mean calculated engineering of myth and divinity for tangible gain. It would seem a reasonable, and worthwhile, endeavour for a Covenant to try to build up its own Faerie Goddess, with the (non-Hermetic!) powers, abilities and inclinations it wants to exploit.