The Expelliarmus spellbook was a book that contained information on the Disarming Charm. It also contained the instructions on how to perform the spell.[1][2]

Behind the scenes

"What you have to do, is to find the Expelliarmus spellbook somewhere beyond the portrait. Once you have the spellbook in your possession, the Expelliarmus spell will be yours to use as you see fit."
— Gilderoy Lockhart instructs Harry Potter on where to locate the spellbook[src]
"Got it! The Expelliarmus spellbook!"
Harry Potter upon finding the book[src]
"I remember, the Expelliarmus spell!"
Harry Potter upon reading the book[src]


Notes and references

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