They came from... well, don't worry about that

As a prelude to unleashing Sorcerers on the world, I wrote the necessary code to implement Summoning powers. This was actually a lot of hassle, as in my rush to move things forward I had completely neglected to arrange the game system around allies. Consequently, a lot of code had to be completely rehashed (and may, in the future, turn up new bugs, so I will be keeping a close eye out). Just as I was about to release the code into the wild, I ran into serious domain transfer issues (I began the process some time ago to move to my wonderful new host, faelix.net). So everything has been delayed.
I have now, finally, updated the code. So now, depending on your society/form, those Summoning powers which were previously inaccessible will now be available. No doubt game balance will rear its head at some point, but for the moment I am content to let things play out for a little while.