Spider repelling spell

The Spider-killing charm (incantation "Aronia Eximè")is a spell used to kill, or at least,blast back an acromantula or other large spider. Harry uses this in the Forbidden forest against the attacking acromantulas in the film version of "Harry Potter and the Chamber of Secrets". He learned this from Tom Riddle, who used it against Aragog in the memory Harry visits in the same movie.