Good catch; though its likely an error, the Path of Stone does make more sense as a Druid Path. Although I wish it was open to both Druids and Sorcs.
FL really dropped the ball on magic in this game; far too few spells, and the ones that are there are underwhelming, even for a gritty S&S setting. The sorcerers in Conan & Elric stories had many more useful abilities.
I don't agree that they are underwhelming, you just have too think a little different about how to use magic. Our stone singer for example created some golems to fix Mrs Polmors mission in the Hollows without being noticed, and when they met a big beast in a cave he used his magic to do a cave in which saved the group from a TPK. The first one would have been hard to do without magic, and the second one would have been impossible to achive with normal skills.