PK Mode is open
PK Mode is opt-in, from base level 60. Switch it on from the AUTO / PK button and you can attack any level 60+ player outside towns. Party and guild members are never hit.
Strike first and you are marked for 60 seconds: any level 60+ player may hit you back, and killing you is self-defence. Kill a player who did nothing and you turn red: 4 hours of online time per kill, 10% of your account's Zeny on your head as a bounty, every NPC refuses you, and anyone may kill you, even in town.
Clear your name by serving the time or by killing 10,000 monsters near your level. Bring a red player down and the bounty is yours. The PK Mode article in the wiki has every rule.
