"Today's lesson will most assuredly involve learning how to cast the Softening Charm, Spongify. Once you have managed to collect the Spongify spellbook, the Spongify Charm will be yours."
—Filius Flitwick explains to the pupils how to cast the Softening Charm.[src]
"The Spongify spellbook!"
—Harry Potter upon finding the book

The Spongify spellbook is a book that contained information on the Softening Charm. It also contained the instructions on how to perform the spell.

During his first year, Harry Potter was chosen by Filius Flitwick, to try the spell's challenge, and to retrieve this spellbook. Harry succeeded and effectively learnt the Softening Charm.[1]


Notes and references

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