User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-67.247.232.39-20130306004535/@comment-3146930-20130306212929

While the gods are all powerful and can live forever, they can be destroyed in some ways. Kronos for example tried to weaken the gods by destroying their thrones and weakening them with battling Typhon, almost resulting in Olympus itself being lost. Gaea on the other hand plans on destroying the source of their power, the original Olympus. Something like that would weaken the gods and possibly causing them to fade (as said above, the only true way for a god to die).