From the Intro:
Welcome to a Legend Quest adventure. This LQ supplement is a self-contained mission. Everything needed to run this scenario is contained, except for the people. This mission can be used as a one-shot game, the beginning of a campaign, or as a side mission for an existing campaign, however it fits best in your plans.
Acquired at Gen Con in the early 90's, this may have been a con scenario or something included as a special bonus item. It is separate from the "core book" and (as above) calls itself a supplement.