Pretty simple to do in a group. This allows you to keep your key and spam good layout keys with gold find indefinitely and kill the boss as well.
- Be in a group
- At any point before killing the boss of the dungeon while inside the dungeon pass leader of the party to a party member.
- That party member DECLINES the popup.
- That party member passes leader back to you.
- You DECLINE the popup.
- After killing boss just leave the group and have your party members join back on you. Your key will be reset and you can run it again.
Have fun, this is how everyone has been leveling in season 1.