A hero becoming a God?

Very, very interesting. Should this happen, I can't wait to read it. I can't imagine Undasis will take kindly to a mere mortal attempting to ascend to Godhood, however, so expect a healthy bit of opposition on my part :)

Perhaps it's possible to steal divine essence from a god.

Like, perhaps God's have a sort of blood. If a very strong Hero were to harm a god and drink the blood, they would take in some of the God's powers and become divine themselves (or at least close to it). This way they have to be tough enough to harm a god (or be able to convince a god to harm [i]themselves[/i] and give up some blood).

 To make it so that not just anyone can achieve Godhood, we could say that the god-blood kills most mortals and, as such, only the strongest of heroes could consume god-blood and become a Demigod.

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Perhaps not the best idea, but this is just from the top of my head.