How do Wizards in your game make backup spell books (also p.114) with this houserule in place?When the party in our game found the spellbook of a dead wizard, I did allow the two wizards in the group to copy it using the standard costs and timeline outlined in the PHB (p 114) with an accompanying INT check per the scroll copying guidelines in the DMG (p 200). However, I also ruled that once a spell was copied, the spell disappeared from the original book, much like as if it were copied from a scroll forcing the two wizards to negotiate on how they would split up the spell bounty.