I like the idea, but I think we should have some limitation for some players did not abuse it.
For example, you could activate the PvP mode to reach level 100. Players below level 100 can not be attacked by other players.
When activated the PvP mode, you can kill other players. You will be Penalized by killing players, to be Penalized 10 times you will be considered a Player Killer. Any death above 10 will do just the Player Killer status is renewed.
When Penalized, you will receive a debuff less exp received and less gold received, and could not get into dungeons, or participate in pvp arenas 5v5 / 2v2, honest NPCs will ignore you, so you can not buy, sell or repairing items in them. In addition to not use the statues of goddesses.
A player with status Player Killer may be attacked by any player who has level 100+ without activating the PvP mode. Players killed by a Player Killer may apply a reward for the head of this Player Killer. Any Player Killer approaching the NPC guards will be attacked by them.
By killing a player with mode PvP activated will not be applied to Penalty.
Around the statues of the Goddess is a safe zone, as well as cities and other places deemed necessary.
The debuff Penalty(1 to 9 deaths) and Player Killer(10 deaths or more) will only be removed from the player if he stays online near some statue of the goddess for a given time (there may be quests to reduce the Penalty)
You may have a chance to drop the equipment or random items from players with Player Killer status, but I’m not sure in this regard.
Well, I believe that’s it. Maybe I am missing something that would suggest, but the idea is this.
Maybe something is confusing, forgive me for my bad English.