Party restrictions.
Parties have two main ‘purposes’ ingame:
(I) All party members ‘share’ a combined damage pool at world boss events, helping ensure everyone has an increased chance at event success rewards (Bronze/Silver/Gold), based on the party’s damage rather than the damage of individual party members. Also carries over into Dungeons and LS/PS/Hearts events etc).
(ii) The social aspect of having a group playing together as a team and communicating/chatting/organizing as a party. Plus the associated bonus of working together on activities rather than just running solo (Hearts/Map Completion/PS/LS/etc). Friends that slay together stay together
There is an ‘area of effect’ tied to Parties though, the pooled damage bonus only works inside the radius of the event. Being in a Party but being on different maps or spread out all over a map just means your being social, not that your still combining/sharing your party damage bonus and event contribution.
Ingame, watch for the Event Circles on the map and whether or not everyone has the Heart/Instance/Event text up on their UI – that will generally let you know if everyone is still ‘in range’ for combined rather than individual scoring.
That’s about it…Party up to gain a common advantage, or just to be social and play as a group rather than solo.
Also, Boons will be prioritized to party members rather than random nearby players.
re·ward – a thing given in recognition of one’s service, effort, or achievement
en·ti·tle·ment – the belief one is inherently deserving of privileges or special treatment