I think PKers can kill ppl without the PK mode on but there are a few things you have to keep in mind when you are in PK Mode:
- Anyone is able to attack you.
- You can't PK players who are under level 30 and you can't PK in Pandaemonium, Sanctum, Marchutan, Kaisinel.
- Pker doesn't get AP or Exp when killing a player.
- Each player killed will raise your PK duration, time during when you can't toggle off the PK switch (A new pker will get 1 hour PK penalty while a PK lord will get 10 hours per player killed).
- If you kill a player which is 10 levels below you, your penatly duration per kill is doubled, and your PK rank counter is NOT increased.
- Depending your current PK rank, you might drop any item you're wearing.
You have to be very crazy/angry to use this.