The Minor Illusion cantrip lets you create either an image or a sound for one minute. The text gives a variety of explicit and implied restrictions if you create an image, but seems extremely broad if you choose to create a sound.
If you create a sound, its volume can range from a whisper to a scream. It can be your voice, someone else's voice, a lion's roar, a beating of drums, or any other sound you choose. The sound continues unabated throughout the duration, or you can make discrete sounds at different times before the spell ends.
Whereas the image case of Minor Illusion specifies that the image must fit in a 5 foot cube, there is no text dealing specifically with the position in the sound case other than the 30 foot range of the spell. In fact, the text doesn't seem to say that Minor Illusion in sound mode has a target in the usual sense.
- Do the noises have to sound like they originate at a particular point, or can they seem to just generally pervade the 30 foot range if so desired?
- If there is an origin point of the sound, does the origin point have to stay fixed throughout the duration, or can different "discrete sounds" originate at different points?
- Is it possible to create a continuously moving sound within the range, like an illusory conversation that wanders by a guard in a hallway?