NICE

This command is used to determine who you can be aggressive to. For example, when casting area spells you might not want it to hit other players by accident.

clan      You will not hurt clan members by accident.
faction   You will not hurt mobiles you have friendly faction with
          by accident.
never     You will never be nice and will hurt any and all foes.
player    You will not hit other players by accident.

Note that you are always considered to be nice to group members.

The nice flag is ignored in the arena or battlefield, and against players who are known to be unpunished PC-killers or PC-thieves.

For example:

nice player clan (nice to players and clan allies, mean to faction)

You can enter "status nice" to see your current nice levels.