In my question here, I asked if Patronuses were corporeal or not. The answer was that they are decidedly so, and can interact with the physical world. Now my question is if they are indeed corporeal and can be touched and moved, can they block the curse from Avada Kedavra? "You produced a fully fledged Patronus?" "Yes," said Harry, "because -" "A corporeal Patronus?" "A - what?" said Harry. "Your Patronus had a clearly defined form? I mean to say, it was more than just vapor or smoke?" (Order of the Phoenix) Answer It might be possible to block Avada Kedavra with a Patronus. Canon doesn't suggest this anywhere, but there are other situations in which Avada Kedavra has been blocked or diverted. For example: In Goblet of Fire , Voldemort's Avada Kedavra is blocked, or at least held at bay, by the Priori Incantatem spell, which can disallow wands with dual cores (cores from the same source, as Harry and Voldemort's...