There are two different types of nodes: Dungeon and Raid Boss. For Dungeon Nodes, each Completion Star earned by any of member of the Alliance will contribute to the total required to complete the node. If it requires six Completion Stars, and two Alliance members both get a three-star victory, then that’s enough to clear it! For Raid Boss nodes, the Raid Boss just needs to be defeated to progress. This will require some major effort though, as the Raid Bosses all have their EX abilities and massive HP pools. Damage persists between battles, so the entire Alliance will be able to contribute.