The Oltifact

Wonderous Item, uncommon (requires attunment from a humanoid)

A well polished iron nose that looks as though it was broken off a sculpture.

This magical nose grants the power to saturate the olfactory sense of any humanoid creatures within a 40 ft line of sight.

The smell smelled by creatures under the influence of The Oltifact is harmless but negates the smell of all other smells that are smelled by the creatures. The smell can be localized to a particular area within 40 ft of the user that is within line of sight.

As an action, choose any number of creatures you can see within 40 feet, the targets must make a DC 15 Charisma saving throw or be overwhelmed by a powerful smell. The smell must be one you have smelled before.