The Order of the who? Of the What?
If one travels, you might notice it. Each one has a blue orb on their signage or somewhere in the shop. The merchants seem to specialize in foreign goods, but often buy local produce and products, to trade in other places. They seem totally unrelated to the others. It seems to be a secret organization, but nobody knows for sure.
The Blades of the Golden Sun are an organization lost to history. They are a legendary group, with songs, stories, and histories written about the exploits of their members. They were warriors of the famous Sun Swords, fighting against “The Evil”, the Dark Night.
A great listing of names and short descriptions as well as fleshed out groups/ societies/ and organizations.
The secret for immortality has been discovered by an eccentric wizard/mad scientist. Its found you need to reapply once a month. As people stop dying, and the birth rate increases exponentially, people are forced into homelessness, because of the need for food reamins the same, and food is not being produced fast enough to feed the undying population. The PCs have to find the creator and kill him, and destroy production, to save the world from undying, unending torture from hungryness.