Wow. All I can say for this chapter is that it was awesome--you have some great descriptions in here. I will be returning to this story when I have some time.
Just a couple of things I noticed, minor grammatical mistakes.
---His screams pierced the otherwise quite countryside.---
The “quiet” typo.
--Salazar’s wand flew through the air and into Gryffindors free hand.--
You forgot an apostrophe in “Gryffindor’s”. You did the same with the same word when talking of Gryffindor’s family sword.
Again, this is fantastic. I love epic tales!