These adventures can take place in almost any location on Oerth. They are often one-shot adventures that run at larger national shows. Core specials give greater detail to and address pivotal points of a larger core plotline.
The Origins convention adventures were released for regular home play for RPGA members, but the GenCon and Winter Fantasy ones were generally limited to those shows (and sometimes a few other shows).
Many of the "Core Special" adventures were provided in two or three formats for different levels of play. These would either include a "Low-Level" and "High-Level" pair or a "Low-", "Mid-", and "High-Level" version. Generally speaking, these level versions featured similar narrative plots but different opponents and challenges (however, sometimes the adventures were quite different).