>>96016737
>When the "reality rot" becomes unmanageable for those on the material plane
This has a name that I won't mention in case my players peek in this place. It is beings without form, it is form without substance. Foolish cultists worship it, thinking it's a way to usurp the gods and free mortals from the influence of the alignments. This is totally false, it's of no threat to the gods in actuality, but it does disrupt their "game" on the material if it spreads too far. Undead Shadows, spheres of annihilation, and similar "paradoxes of identifiable nonexistence" are examples of "reality rot". These have no alignment, they register as true neutral. If it becomes too much of an issue, the gods once again pave over the old. There is a fair number of pockets of this rot deep beneath the earth, like painted-over mold.
>When mortals obtain the realization that killing gods is possible, and obtain the means to do so
A god can kill a god. A weapon created by a god to kill gods, can still kill gods even once its creator abandons it or is slain. Numerous artifacts over forgotten ages have been found - made by either long-forgotten divine hands or mortals who somehow figured out the secrets of the universe - that hint at the fact that a divine being is still a BEING, and more, as stated earlier, of a gatekeeper, filter, quartermaster of the cosmic energies, not their source. Some gods' wars were caused not by escallation of conflict among the gods themselves, but by uppity mortals disrupting the divine order and having to fight for their places among the pantheon. Or die trying.
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Pic unrelated (Or is it? It's unrelated, I just thought it was 80s enough to be inspiration for a useful bizarre magical object for someone's game.)