You don't have to warm people that this is a different ending or non-canon, just put AU as one of the warnings, ( Alternate Universe ) that means that people who prefer canon don't have to read it, and those who like AU will know.
Author's Response: Thanks for the hint.
Please carry on this story; I like alternate endings, especially if they're dark and include character deaths! (I sound so darn EVIL!) Meerkatalex
Author's Response: I certainly will keep this going. I am so glad someone finally said something in a review for this. Thanks so much.