It was a one off DnD thing.
We were Vikings sent to Hades to return our Chief to solve some big problem.
Fight a bunch of stuff. Ride the river of death.
In the end, we find the Chief ... but we can't return him to mortality without someone taking his place.
And, in the spontaneous Spartacus moment, each member of the group demanded they be the one to make the sacrifice. No hesitation.
Of course that was the answer. Death ... well ... turns out he's a reasonable fellow. The cosmic balance is just mumbo jumbo. Be on your way chaps.
It would make a great one page Adventure.
(But in the Zen version ... mumbo jumbo might just be real.)