DUEL

This feature of the game will allow you to pk for fun inside or outside of
a player killing area. If you have duel turned on, it allows another
player with the same flag to attack you, no matter where you may be. You
are able to know which players have the dueling flag on by the DUEL flag
that is next to their name. If you have the duel flag set, you will see a
D at the start of your prompt.

Unlike normal player-killing, players do not receive blood when they
attack others. Being PKed will not reduce your blood if you have it.

If you die, DUEL is automatically turned off to prevent you from being
pk'd multiple times in a very short period of time.

The only way to turn off DUEL is to make sure your hitpoints and mana
are at full capacity before typing 'duel'. This is to prevent people from
turning it off whenever they need to regenerate.