Quote Originally Posted by Theodoric View Post
Isn't sorcery just Psyker stuff with extra mysticism? I haven't really kept up with the fluff much but them being exclusive categories instead of complementary is news to me.
The most important difference is this: you have to be born a Pysker, but anyone can do Sorcery. Pyskers are often better than normal people at Sorcery, but anyone can do the rituals. And anyone can screw up the rituals. This is why books on chaos are so dangerous, because in anyone's hands they can get a planet accidentally eaten by daemons.