Augusta Longbottom showed up to the Battle of Hogwarts, ready to kick some ass.
Sybill Trelawney killed Fenrir Greyback with a crystal ball.
Grawp joined the fight.
Ron wanted to save the Hogwarts house-elves.
“CHARGE!”
When the trio couldn’t conjure their patronuses, Luna, Seamus, and Ernie MacMillan saved them.
Dumbledore didn’t tell Harry about the Hallows because he was afraid Harry would make the same mistakes he did.
Kreacher joined the fight
The Malfoys were still there when the battle ended.
Harry used the Elder Wand to fix his own.