Invisibility

After some basic experimenting, Weiss determined that her creation had the ability to turn a user invisible. The crystals that were formed were all fairly uniform in size, and she figured that each one could turn a person invisible for roughly 3 or 4 hours.

While under its effects, the user would be completely undetectable by any means. Even something like a thermal camera would prove useless when put up against this.

One odd thing about the dust, though, is that it only worked on living beings. The invisibility effect could only take place when interacting with aura and, by extension, a soul. And this would only effect the user themself. Any clothes or gear they happened to be wearing would still be perfectly visible for the duration. Weiss blushed at the implications of this, and resolved to refine her creation to be more useful. But that still left the original batch to put to use.

Now, the only question remaining is who decides to put the dust to good use?