A Party ability affects you normally and can also be shared with other characters. You may give the ability to any number of characters during a break and the benefit applies whenever they are within sight of you. Characters may only benefit from one Party ability at a time, regardless of how many you or other characters have, though you may grant different abilities to different characters at the same time. You may revoke a Party ability at any time if you so choose.
If the ability is granted by a sanctum, residents of the sanctum may choose it as their Party ability, but remain limited to one Party ability at a time. The owner of the sanctum may revoke its Party abilities, but residents need not be within sight of the sanctum or the owner to benefit from them.