A411

Cantrips are not written in spellbooks. Read the Spellbook feature:

Your spellbook is the repository of the wizard spells you know, except your cantrips, which are fixed in your mind.
RAW, there is no way to write a cantrip into a spellbook. And even if there was (or if you acquire a cantrip scroll, which do exist), there's no way to take a written cantrip and learn it.


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