Ideas - Pushing Dasies
A new show with a lot of promise. A simple plot point that fits well into D&D is that he touches something dead and it comes back to life. If he touches it again it dies forever. If he keeps it alive more then a minute, something else has to die.
While much of this is straight forward, clearly it is too powerful to be that simple. And with death never being permanent (well never say never) it is either too powerful or not worth using.
There is room for using a similar concept. A curse on a mage or priest that if he killed anything, something else has to die. Not quite the pacifist but he would certainly have to consider the risk of taking a life. The side benefit would be that another enemy could die.