The original version of this now-differently-named phenomena will be treated in an upcoming rleases from the Original Campaign and I was thinking about those tie-ins just recently when organizing the 'CATALOG'. Given that many centuries have passed since their creation and first use, what might be found by placing an octych in the star is quite open! However, the destinations were still left undetailed, as an opening for DMs to create adventures of their own. This idea was carried through into EttRoG, where a single octych was also made available for discovery.
In their update of Maure Castle for Dungeon Magazine, Jacobs and Mona introduced the idea that the star and octychs (as they now became called) were created by disciples of Slerotin, who were afraid to use Power Magic and thus decided to leave the Oerth and await the future learning of their descendants. I imagine they would have led to places like Dungeonland and the Isle of the Ape, or the other worlds found through the doorways on level 4 of the Demonweb Pits. In WG5, it states that the locations of the eight triangles, and the destinations they led to, would eventually be revealed as part of the World of Greyhawk range.
