I agree with prof1515, that most good RPI muds have PKs. I think perma-death and realistic PK brings emotion to gameplay.
I know you are not asking that, but I recommend playing some city-bound PCs which are somewhat protective under laws. For some harsh and extremely rich envorment Armageddon Mud and for beatifully designed Lord of the Rings atmosphere, Shadows of Isuldur Mud.
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