I'm reposting this here for
montavilla who posted it over on the Fannish Magic introduction thread.
I'm reposting to make it more visible.
Montavilla says:
I'll try to start with the obvious: Legilimency/Occlumency. It's such an intriguing idea and I'm fascinated about how it would work in the Potterverse. There's a couple interesting approaches that I've read.
In one story, Snape and Harry resumed their lessons in the sixth year--with Snape also teaching Harry Legilimency. Harry eventually learned enough legilimency to control which memories he would see in Snape's mind, which were linked through association. This proved crucial when Harry needed to search Voldemort's mind for specific information. At one point, Harry was able to use the mind connection (which becomes an emotional as well as mental bond) to save Snape's life when he is in a coma. Afterwards, Dumbledore chides Snape for ignoring the theraputic uses o Legilimency.
Another interesting approach was in a story where Snape is routinely Legilimensed by both Dumbledore (who doesn't exactly trust him) and Voldemort. Snape uses a type of memory system (which is a real-life method) in which he creates an inner world for himself, based on his upbringing in Knockturn Alley (the story is AU). One of the intriguing things is that he creates a secret nook in his childhood bedroom, where he can retreat in a pinch. Voldemort isn't aware of that secret spot, but, if I'm remembering correctly, Dumbledore is.
In writing about Snape, I picked up on these ideas and tried to explore how Snape would learned Occlumency and Legilimency. Since he starts with the assaultive technique in teaching Harry, I had him initially taught by that method. I had Dumbledore giving him some books on theory, which allowed him to explore on his own in his school years. The books used the archetecture metaphor (which I also stole from Dorothy Dunnett, who likened the mind of her hero, Lymond, to a citadel). So, he builds up his Occlumency chops by creating a castle in his mind.
In the last chapters that I've written (it's been awhile, but I'm still sort-of mulling through this stuff), Snape meets up with a witch who uses a different metaphor, which is more subtle. Instead of creating thick barriers, she teaches him to use illusion and trickery. The reason for me to include this is because he needs to learn a method that Voldemort not only can't penetrate, but doesn't even sense is there. I figure that it's not enough for Snape to simply block Voldemort. He has to block him without letting Voldemort know he's doing that.
Before I really started that, though, I wrote a piece that involved Snape using his mind tricks with Voldemort. It was my take on what Snape was doing the night that Sirius died (to prove that he wasn't just wasting time before he contacted the order). The relevant bit is
Chapter Two.
The link is there if you care to read it. If you want to read the rest of story, I'm of course delighted, but he doesn't do any more legilimency or occlumency in the other chapters, so they aren't really relevant. Feel free to discuss it. The story's done and it is what it is, so I'm not going to get my feelings hurt. :)