(OOC: Several minutes, eh? Innnnnnteresting. I'll see what the others do. Meanwhile, is Anvuss going to wind up with any desires other than to understand the machine? Since everyone else is already in--I'll fully come clean since it might help.
Each gem is capable of being used as one-fourth of the energy needed to grant up to three wishes. However, if you keep the exact same four gems in, the array can continue to grant any wish (or multiple wishes) from a new person that can be achieved by doing one or more of the same things those gems already know how to do. It is the case that the original ruby for the array was lost after one use, so the Wyrd Ruby has been used twice, the others three times (so no more new wishes since three of them are out of energy), and it remembers the two wishes it knows--it can open that portal, or it can turn you into a woman. It will do this if it seems like your desire can be granted by either trigger. For instance, Aethelus doesn't care at all about the kids, but he desired personal power and secrets of artificing that would put him ahead of his peers, and that was enough. Kharas was simpler and just wanted to find the kids. However, wanting to know how the device works will not be accomplished by doing either of those things.
Does that help? He could always wait for one of the other two to figure out how to return, as well, in which case they could bring him in also because the array has become a portal for them)