You know how the story of Diablo 3 just doesn’t make any sense? And you know how Deckard Cain is kind of like the unofficial “hero” of the story, even though he gets killed off in the first act (OOPS SPOILERS)? He does all that research on weird esoteric stuff, and he knows all the batshit-crazy lore about which devil fought which angel and when, and then all he managed to do is tell it all to you as a disembodied voice over… I mean, the guy basically knows everything. According to this reading, Diablo 3 is an expression of the tortured mind of Deckard Cain and his attempts to stave off dementia and senility.
Read this way his own “death” in Act 1 becomes a transcendent event that, far from being a fearful one (Deckard is suppressing the reality of his condition by retreating into his deteriorating mind – that’s why the story keeps getting worse as it goes along!), is actually his imaginary escape from the limitations of his own body, into the safe realms of disembodied knowledge.
Small wonder then that the hero/player-character is such an insufferably confident egomaniac: “guided by prophecy” is just the convenient excuse to express the innermost desires of Deckard’s repressed Ego (scholars are always repressed). It’s also a fantastically simple explanation for why every character repeats the same story four times! The repetition reveals Cain’s desperate attempts to hold onto his failing memory, as he goes over and over his knowledge again and again, returning to rote learning exercises in a tragic, yet futile gesture. No wonder it’s so grindy.
This “story” would only ever end, if – or rather, when – the player forgets to ever return to Diablo 3 and never plays again, thus completing Cain’s slide into mental oblivion.
Wouldn’t it be amazing if Diablo 3 actually supported this interpretation? Now that would be a story.