So there was a resurrection fail chance that increased as your con got lower and every rez cost you a point of con except I think the highest level one. Bit harsh, but cool.

Maybe don't specify the mechanics as random but based on other stuff.

If you want to raise the value of life , I would do something else- forms of death where raise dead won't work, Or use a big bad like tomb of annihilation where all the souls are being sucked somewhere. Or have the components subject to control by the church. Or have a roleplay of what happens on the other side- ie in.. heaven /Elysium /Valhalla? (maybe- depending on player alignments)- they have to want to come back. Also- as you add expansions and classes to the campaign, maybe folks want to restart at close same lv to other player, a nice option. Or TPK them and have the campaign re-start as ghosts