Sorry if this has been answered but I've been Gooleing and scowering forums all morning for this specific point. Correct me if I'm wrong, but it appears sorcerer does not prevent the one point of permanent corruption from learning a spell in school or not. Yet there are spells listed as being in the Sorcery school. I'm trying to figure out why there even are sorcery spells when they are treated the same by the sorcerer as if they were from any other school.
On a related note, does it also cost more permanent corruption to buy an additional rank of a spell out of your school?