True. That. Also if you ever want a laugh, check out the reactions page on the forum. People were pissed with how overpowered turnamancy turned out to be. I think half of them are planning or already conducting home brewed games based on their interpretations of the Erfworld rules or something.
Come to think of it, if Balder doesn't come out with a Rule Book after the series is done, he's missing an opportunity there. Of course if he does it while the series is still ongoing, his life will become a living hell as every nerdy rule lawyer (basically 3/4 of his audience) complains about the inaccuracies in every single strip....
One of the things I like most about the series is that "Retconjuration" is actually one of the schools of magic, although it wasn't originally, he retconned it in. Damn Rob. That's pretty awesome.