Milcom MiasmaKarma and Christianity's final judgement both seem like concepts designed to prevent bad behavior rather than mete out justice ex post facto.
Both frameworks allow for atonement of the offender, so basically ethereal coupons of offsetting behavior, but neither belief system makes whole the aggrieved party.
The best they get is their belief (and satisfaction) that the offender eventually gets what's coming to them.
I really hope I never have to explain these concepts to aliens.