Black Desert
In the MMORPG Black Desert, any player can participate in PvP once they reach level 45 and “flag” themselves for PvP. This shows that you are ready for player versus player combat. You can be attacked anytime and anywhere. It is even possible to attack players who are level 45 but not flagged for PvP. However, that should be thought through carefully.
If you attack a “peaceful” player, you lose karma. This means that NPC guards will attack you and other players will not face any penalties for attacking you. Additionally, there are battles in arenas and guild wars. Particularly interesting are the siege battles, where factions fight for territories or important points, granting many advantages to the winners.