@mikemearls if a wizard finds a spellbook, can he use that spellbook as his own. Also can a wizard prepare spells from two separate books.
— Robert (@Mentalburnout) January 5, 2016
You still have to scribe the spells into your book or a new one. Scribing it is part of the process of mastering it. https://t.co/3L1heWBVQG
— Mike Mearls (@mikemearls) January 5, 2016