So last night I was messing around with Grey Elf's Classic Edition website, for our Halloween gam, The Halloween game has been moved because of work scheduling. So let's talk about planar echoes & times from the Starship Warden which have allowed a number of alien races through the gates before they've collapsed. And its actually S3 Expedition to the Barrier Peaks by Gary Gygax that may hold some of the keys of this dark end of the Warden.
The Mihalli are also absolute enemies of the mind flayers one of the alien races aboard the science & ecological vessel of the Warden. These horrors are thought to be the root cause of the crash as the player's PC's try to stop their machinations.
The recent Goodman Games Classic Reincarnated #3 S3 Expedition to the Barrier Peaks had some interesting additions to the original module which gave alternative & addition materials. And there's the fact that we have no idea what may have happened aboard the Warden Science spacecraft. But one theory that recently floated across the table was the fact perhaps ' the Mihalli' of Empire of the Petal Throne rpg fame from Dragon magazine issue #4 may have something to do with the crash into the Barrier Peaks. The Mihalli are ancient aliens who were some of the Human Empires oldest allies;
"The Mihalli are an ancient nonhuman race which came with humanity to Tekumel — but not with humanity’s knowledge or blessings! When the planet was cut off from interstellar humanspace, the Mihalli, who had set up a small spy post beneath the planet’s surface, were cut off as well and could not return to their original world."
I've also found some intersting snippets in the blue room archive. This section on races for instance.
[who are these inimicable beings???]