Perhaps aging and/or character death.
Could be done via constitution.
With each death you lose a natural constitution point.
Rez brings back your lost xp and the lost con point for a death.
When your natural con drops below say half the natural level you can no longer be rezzed because of your weakened con.
When your natural con drops below 10, your character dies perma death...drops all items on the ground and you must start over.
Quests in game can bring back con points etc..
Could be done via constitution.
With each death you lose a natural constitution point.
Rez brings back your lost xp and the lost con point for a death.
When your natural con drops below say half the natural level you can no longer be rezzed because of your weakened con.
When your natural con drops below 10, your character dies perma death...drops all items on the ground and you must start over.
Quests in game can bring back con points etc..