/blockaid

From FFXI Wiki

The blockaid command acts as a deterrent to MPKing your alliance.

It can be turned on via the command /blockaid on. This prevents players from outside of your alliance from acting upon you, thus generating enmity towards the monster you are fighting. This command proves useless, however, if only a single party member forgets to turn it on. The command also functions to block trade requests and party invitations.

Blockaid can be turned off with the command /blockaid off, or by changing zones. Verification Needed