Party Formation panel

The party formation panel shows the current members of your party, and the allowed number of members in your party. As you progress through a campaign, the number of allowed members will increase.

Hard Mode
When you have completed the final mission in a campaign, an option for Hard Mode will appear. You can choose to party with other players who are eligible for Hard mode. However, if a player who is not eligible for Hard mode joins your group, your party will receive the following message:

Hard mode has been disabled. (player name) does not meet the requirements for Hard mode. The ineligible player will need to leave your group before you can re-enable Hard mode.

Players using the Party Search panel to seek out other Hard mode players will have a [Hard Mode] tag in the description field by their name.