I have discovered that when you invit real ID friends from another server, and taging to a dungeon together, you will get the buff.
Luck of the Draw which increase your dps, Health and healing. It seems to works likes if you were joining with random players. It works only with real ID friends from another server.
Normaly you cannot have this buff if you don't meet random players.
Maybe it could be usefull for people who still doesn't have the amani bear yet.
I hope it could be usefull for someone.