(6th Level Lunar Secret) When you cast an illusion spell that has a duration of 1 minute or longer, you can use your action to change the nature of that illusion (using the spell’s normal parameters for the illusion), provided that you can see the illusion.
(2nd Level Lunar Secret) You learn the minor illusion cantrip. If you already know this cantrip, you learn a different sorcerer cantrip of your choice. The cantrip doesn’t count against your number of cantrips known.
When you cast minor illusion, you can create both a sound and an image with a single casting of the spell.