This thread now has me thinking more about the implications of a setting where everyone knows that not only are gods unequivocally real, but so are afterlives. Like, you can visit them and come back. Player characters often do.
My favourite is Eberron, and I guess the OP conflict with Muscular Netural would work better in such a setting.
For example, given that you know that there is an eternal afterlife, wouldn't you expect everyone virtually everyone, aside from a few incorrigible sociopaths, to be doing whatever they can, all the time, to get into one of the good ones?
Like, Karl Marx argued that religion is the opiate of the masses, and that was just based on the promise of an afterlife that he didn't believe in and, let's face it, most people have to have at least some doubts about. But if an afterlife is 100% guaranteed, then that completely changes the equation.
Sacrificing yourself for a noble cause should be a no-brainer. Grief would be completely different. And are you really going to commit terrible deeds when an eternity of torture is a veritable certainty, as is an eternity of joy as a reward for showing some restraint?
Yes. And above everything else, since the Lower Planes are defined by the Evil Gods, those Gods would be silly not to make the Lower Planes the nicest place to reward their followers the same as Good. Even if they didn't think of it first, they should see the benefit after the first generation of two of people siding with the better afterlife proposition. Maybe it couuld be attractive differently (if you're Good, you get to bathe eternally in the warm light of Torm. We, on the other hand, have succubi) but in both case the afterlife should be attractive. The idea of a Good and Bad afterlives depending on your action comes from monotheistic religion, where there is a right choice and a wrong choice, and the Evil side isn't simply an alternative to the Good choice.
So maybe we get wrong depiction of afterlives (because we only get the Good version of it). "Here, on the LG side, if you are Good and sacrifice yourself in battle for righteousness, you get a direct entry to our afterlife. Everything will be Good. You'll get to do... basically nothing that would harm anything, sustained as everyone else by divine will, and you'll be rejoicing. No, you won't be able to play dice, because gambling can lead to Evil. Sex? No. Absolutely NOT. Talking to other people? Sure, as long as you don't speak ill of anyone." "Err... sure it's tempting but..." "Oh, and you get to not go the Bad afterlife". "Oh?" "Yes, the damned pay the price of serving Evil by living a very Evil torture forever". "Cool, I guess I'll join".
"Look here, they are engaging in carousing! And here, debauchery! Look at all the torture you've escaped from!"
If you make the Evil afterlife too attractive, though, nobody will take the Good alternative. So maybe the Evil God can't create a truly rewarding afterlife, and there must be a dimension of struggle, so people choosing Evil would be tempted by the Evil afterlife and reading the small line of "But if you're not evil enough, you'll be a servant of a more useful evil worshipper and you access to carousing and debauchery will be much rarer". So the afterlife would be a bet, where if you're not ethically aligned, you choose between the safe Good afterlife, and if you're willing to take the risk, the Bad afterlife.
And, per my example above, is forcibly converting people really wrong when it does, in fact, guarantee them eternal bliss?
If converting people is enough, TBH, the Good thing is to convert babies and put them to death. Sure, murder is very bad, so the executor would go to Hell, but he would save countless people before they have the opportunity to be damned. He'd be a hero sacrificing his soul for the greater good and would probably be pardonned (and even if he isn't, he'd still be saving thousands of souls). That's quite dystopian but in line with Good is altruism AND there is an objectively Good eternity after the short passage of mortal life. It would be so despicable from our world's point of view that the game would have a hard time presenting a civilization (short-lived one, probably) deciding on this policy as Good. Yet changing the fundamental parameters of what is existence would certainly change ethics a lot.
But if entering the patron god's realm requires being faithful all you life instead, then just converting people wouldn't be enough. In such case, most people would be turned into a brick in the Wall of the Faithless, not because they lacked a patron god, but because they faithlessly claimed to follow a god and didn't act accordingly. In which case you can get both side rewarding their own, and all the insufficently aligned (both Good and Evil) would be bored for eternity.
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