I was just thinking of a campaign start. So pre-story has the heroes being a party who went on many normal traditional adventures. They faced enemies both living and undead and mundane and magical, and it all resulted in them reaching the heights one can go (as in level 20) before finishing it with an epic battle against a would be god. With said entities defeat the power of Creation became theirs, making them Godbound. How the world looks post epic final battle depends on what the players want - they might have won but at great cost, the world in shambles or they may have won and the world goes on, just as fantastic as before, or they may have won but things are slowly unraveling.
As Godbound one of their automatic Words is Peak Human (even if said person is of a non-human race) to represent their 20 levels of badassery. I think this might be in addition to there other Word options.
Anyway just a random idea! :)
I think best to have the world unravelling...gives them something immediate to focus on fixing.