Fading

Fading is the process of gradually being forgotten by humanity and is the only way that immortal beings, such as gods and monsters, can truly die. Einherjar can also fade if they close themselves off. Fading is caused, at least partially, by the diminishing of a god's realm or people abandoning their belief in them. Gods that are not well remembered or were never worshiped can also fade. Gods seem to be able to resist fading on some level, by finding a will to survive.

If a monster or god loses their will to remain immortal, or if they lose faith in themselves, it can have great influence on whether or not they fade. Pan, for example, sent out a message to tell the world he was dead, in the hope that he would be able to fade. However, the @Satyrs believed in Pan so strongly that he was kept from completely fading, meaning that beings are not always able to fade and can't choose when it will happen. It is unknown if a god must consciously give in to the process in order to fade or if it will inevitably overtake them.

While fading is considered to be the only way for an immortal being like a god or monster to die, @Gaea was shown to be able to revive at least @Stheno and @Euryale, hinting that the process can be reversed for monsters. @Chiron also mentioned that a demigod once Googled the Gorgons, resulting in them appearing even if they had already faded (with the exception of @Medusa). @Medea was also able to reverse the fading of @Helios which is stated to involve summoning him from the deepest part of @Tartarus. When @Apollo convinces Helios to fade again, he states that Helios will be returning to @Chaos which is shown to exist below Tartarus.