Matched parties will always be comprised of four players. Similar to the Duty Finder, players may choose to be randomly matched with other players on the same data center. Moreover, this save data can only be used with the party members and party composition chosen when first entering Heaven-on-High. Players in a fixed party must have uniform save data.
Your character's level, empyrean aetherpool arm and armor strength, inventory, and floor progression will be recorded. When creating a fixed party, players are free to choose any combination of jobs and classes they desire. Next, select 'Enter with a fixed party.' All future forays into Heaven-on-High must be done with the party members and party composition chosen upon registering. After speaking with Kyusei, select 'Enter Heaven-on-High,' then choose an unused save slot.