Mage's Spellbook

This spellbook doubles as a spellcasting focus for a creature that can cast wizard spells. While holding the book, you can use it in place of an arcane focus for your wizard spells. In addition, once per long rest, you can activate the charming sketch on page 47 to conjure a cloud of harmless illusory butterflies in a 10-foot cube centered on a point you can see within 30 feet. The butterflies last for 1 minute, drift lazily through the air, and shed dim violet light in the area. They are purely cosmetic and cannot deal damage, impose conditions, or interact with objects. The butterflies disappear early if you dismiss them on your turn.