Mage's Last Resort

uncommon magic weapon (requires attunement) While holding this staff on your turn you can use a bonus action to speak the command word and transform it into a longsword with which you have proficiency, and can use int, wis, or cha for attack rolls and damage with it. It can be used as a spellcasting focus in either form. It reverts back at the end of your next long rest and cannot be used again in this way until them.