First Spell: Facechange, an illusion that makes you look like someone else

The first spell you've learned is called Facechange, and is an illusion that alters your appearance - including your clothing - to match a mental image you have. This means that you can use it to pass yourself off as individuals you've seen (as long as they're roughly similar in height to you), or as generic people you can imagine. It doesn't let you turn into someone you've never seen but only know of ("the Duke's wife," for example, if you haven't met her).