A few options.
1. Bring back the CON loss from older editions. Advantage to this option is it largely effects all classes (barbarians slightly more, however) equally. Disadvantage is that one or two CON drops in 5e isn't really that big of a deal in the long run, so unless you're killing people left and right, it's not a huge concern.
2. Drop *all* stats by 1 after resurrection. This is probably the solution I'd choose, since it hits everyone equally, and has enough punch to really make the thing meaningful.
3. Introduce permanent disadvantages after resurrections. Stuff like, permanently losing losing an eye (disadvantage to ranged attacks), or gaining a limp, or losing a hand completely, PTSD trigger (disadvantage to all actions under certain conditions), or other such things. This is also harsh, and could easily be tailored to the cause of death, which really gives a way of making sure each scar has a story to tell. "I've never been able to face a Ogre ever since getting killed by the last one...". This could really cool, but only if the players are all on board. Otherwise, they'll just start to be prone to character suicide for the sake of rerolling.
4. Introduce mostly cosmetic physical changes after a resurrection, much like Beric Dondarrion gets after each of his resurrections. He's a pretty gnarly looking dude after a few. And to further the Beric Dondarrion concept, make it so that each resurrection requires something like a CON check that gets progressively harder each time. I think memory loss was another big thing with him; each death meant the permanent loss of some memory chunks, to the point where Arya finds him he mentions having no memories older than being sent by her father to find The Mountain. Not sure how that would play out with PC's, but could be fun.
5. Make each resurrection remove a death save failure check box. So after the first one, you only get 2 fails before death. After the second one, you get 1 failure before death. After the third one, you can't fail at all, and there's no coming back from death via a resurrection type spell.
1. Bring back the CON loss from older editions. Advantage to this option is it largely effects all classes (barbarians slightly more, however) equally. Disadvantage is that one or two CON drops in 5e isn't really that big of a deal in the long run, so unless you're killing people left and right, it's not a huge concern.
2. Drop *all* stats by 1 after resurrection. This is probably the solution I'd choose, since it hits everyone equally, and has enough punch to really make the thing meaningful.
3. Introduce permanent disadvantages after resurrections. Stuff like, permanently losing losing an eye (disadvantage to ranged attacks), or gaining a limp, or losing a hand completely, PTSD trigger (disadvantage to all actions under certain conditions), or other such things. This is also harsh, and could easily be tailored to the cause of death, which really gives a way of making sure each scar has a story to tell. "I've never been able to face a Ogre ever since getting killed by the last one...". This could really cool, but only if the players are all on board. Otherwise, they'll just start to be prone to character suicide for the sake of rerolling.
4. Introduce mostly cosmetic physical changes after a resurrection, much like Beric Dondarrion gets after each of his resurrections. He's a pretty gnarly looking dude after a few. And to further the Beric Dondarrion concept, make it so that each resurrection requires something like a CON check that gets progressively harder each time. I think memory loss was another big thing with him; each death meant the permanent loss of some memory chunks, to the point where Arya finds him he mentions having no memories older than being sent by her father to find The Mountain. Not sure how that would play out with PC's, but could be fun.
5. Make each resurrection remove a death save failure check box. So after the first one, you only get 2 fails before death. After the second one, you get 1 failure before death. After the third one, you can't fail at all, and there's no coming back from death via a resurrection type spell.