Player Groups
Grouping in Path of Titans is a mechanic that allows you to join forces with friends or strangers you are playing on a server with. Grouping is a very useful and powerful mechanic with many uses, such as, completing group quests, coordinating a hunt, forming a herd and much more.

Group Functions
When Inviting someone to a group, the person inviting is assigned as the leader of the group, the leader is the only person in the group that can invite other players to the group.
By going into the group menu and then clicking the social menu on the left hand side, selecting the 'Party' section of the social UI, you will see the list of people in the group. If you are the group leader, you can press the boot button to remove someone from the group, or the star button to transfer group leader to that person.
You will see what creature each group member is playing in the party menu, and how many group slots they take up. Groups have a maximum of 10 group slots, however this can be altered in community servers by server settings or mods. Depending on the playable, you may take up anywhere between 1 to 5 groups slots, e.g Spinosaurus takes up 5 group slots, Styracosaurus takes up 3 group slots, Deinonychus takes up 1 group slot.