Dust of Ibn-Ghazi

The dust (see material component) must be blown from the hand, through a pipe or sprinkled over a single subject. If blown, every creature in a 30-foot cone, extending from the artificer, is outlined in blue, green, or violet light (your choice) if it fails a Dexterity saving throw. For the duration, affected creatures shed dim light in a 10-foot radius.

If the dust is sprinkled, instead of an area it affects a single object or creature in the same way.

Any attack roll against an affected creature has  advantage if the attacker can see it, and an affected creature or object can't benefit from being invisible.