Board Thread:Show-Related Questions and Answers/@comment-5817180-20150420215015/@comment-25926288-20150420221006

He didn't say he couldn't. He could apparently give Cruella magic. But the quill is magic. Can magic override the laws of magic? Yes! But first, they aren't really laws, just "Please don't do!" warnings and quite hard to come by.

SO, unknown at this point. But I would think that the Author and the quill is weaker than the Sorcerer.