Kal online not many players play it and new aren't going to play it but still it has Duel-Ask someone for duel Assassin-Put assassin mask on and kill everyone everywhere except in safezones. Triangulare battles-Registering for tournament. Castle wars- Defend/Attack Castle - Install flag-Win Protecting leader-Two guilds fight each other; one is left with the task of defending their own guild leader while he prays. There are a total of three rounds. If a leader is killed, or the round ends, the roles are then reversed and the defenders become the attackers. Suffering Valley-Two guilds must fight monsters to gain points, higher level monsters are worth more points. Killing opposing players also rewards your team more points. The team with the most points after 1 hour is declared the winner. Destructing Key Points-The goal of this mode is for two teams to destroy towers. After three small towers are taken down, the giant tower can be destroyed. The team who has killed the most opposing players and destroyed the most towers wins.
So yeah so many pvp options,but game in wrong hands.
In Requiem PK is server restricted, as far im aware there are no penalties for PK except for gaining negative status of a murderer, heard somewhere that you cant buy from vendors too for a while but im not sure. Now feature that is available on every server are PvP Arenas/Battlegrounds which are cross-linked with the other servers where battles can be fought up to 500 players on each side. There are also other Battleground modes which are explained HERE and more details about PK HERE. Rest is up to you ;]