It's dangerous to go alone! So take friends. You can form up parties to go off on adventuring expeditions throughout the realms of Necromundus - especially in the more dangerous dungeons. If one character wants another to invite them to a group, first the one seeking an invite has to set themselves up to accept party invites from that individual. So, an example would be &party_invites me=Bob. And then Bob, the party leader, would be able to invite me to his group.