I've got two ideas.
One is a standard fantasy with an intense fear of magic because the gods are callous and petty like those often found in Grecian myth.
And Heroic level they compete with other heroic humans (think many of the heroes of the Torjan War)
After that they become Paragons and begin to see longer quests and weird monsters, plus some additional major heroes (think people as inventive and strong as Odysseus, Hektor, and Aeneus)
Once they hit Epic the quests become truly amazing like the toils of Heracles ultimately allowing them to become hero gods themselves.