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Yallard is the author of a book on Rithmatics which Professor Fitch lends to Joel Saxon.
“ He determines that the Blad Defense should be banned from official duels and tournaments, but he's shortsighted. Four ellipsoid segments combined may not make a 'traditional' defensive Line of Warding, but it's very effective. If they ban it from duels because it's too powerful, then nobody will learn it, and they won't be able to use it in a battle if they need to.
opinion of Yallard's work