Beat the Spikey Spheroids, they'll reproduce... but will even tually die. When the spikey balls turn red and come after you, run away from them so they don't hit you, but when they are headed back into orbit, they aren't glowing. Hit them with Flipendo when they aren't glowing and they blow up. For a while, they reproduce, but then they stop. Read more > http://www.neoseeker.com/forums/4207/t150982-trying-to-get-expelliarmus-spellbook/
