Tobikage posted about this in Global 1 and I wanted to put a writeup on the forums since it is important.
In the Social menu once you’ve joined a kingdom, you will see a Bazaar. This is a small shop, which allows you to spend Honor, Food, or Ore to purchase Keys, Dungeon Marks, or Shards respectively.
There is an interesting system backing this. You and your guildmates can purchase these deals several times a day. If you meet the given threshold for purchases (the first level requires 2 purchases, the second level requires 5, etc) the Bazaar deal will be upgraded and you will receive better items from it.
However, if you and your guildmates fail to reach the upgrade threshold on a given day, you will move back down a tier. To clarify, this means that if you don’t plan carefully and save up before tackling the Bazaar, it will ultimately be a waste of resources.