Originally posted by tdtd
I believe Darth Bane used force storms too, and nowhere in DE did it say that Sidious created the technique..
I believe it was in Dark Empire IV and the source book that said that he recorded the origin of the Force Storm, saying that he was able to immerse himself so deeply in the Dark Side that through a sheer act of will, he was able to generate storms of pure Dark Side energy. He mentions that he does this in the Book of Anger, which is 1/3 of his Dark Side Compendium. So according to that, he was the only one to use it. Whether there has been a piece of EU literature that indicates he was not the first, I do not know.
Also - to my knowledge, Bane never used a Force Storm. From some of the research that I've done, as well as the biographies on Wookipedia (horrible references for this versus forum, I know, but they are among the most detailed descriptions of the characters) - Bane never used a Force Storm. I could be wrong however.