Majority's might. You can get/grant anything that the majority of a group has or anything that is over represented in the group. Or you can get/grant the average of those things. As long as you or the person you're granting is part of the group.

Works on both formal, official-unofficial and informal groups. You can't create your own group. But you can do anything to become part of the group.

except for hurting/threatening the group members or group leaders etc to enter the group.

The group must have atleast 20 people.