Wizards choose new spells to add to their spellbooks at level-up; however, through the course of play a wizard might find that one of the spells she learned is not very useful, and want to exchange the spell in the spellbook for another spell. This is to say: an existing spell in the spellbook is removed, and a previously-unknown spell is added in its place. Is this possible in D&D Fifth Edition?
Good Answers Include
- A yes-or-no answer to the question based on citation from D&D 5E rulebooks. Twitter errata/clarifications or similar statements from the game's designers may also be cited as sufficient justification.
- Any limitations that exist on changing spells, such as "the new spell must be the same or lower level" or "characters can only swap out a spell learned at last level up."