Bladeshimmer

This small vial contains a thin oil that looks like quicksilver.

Bladeshimmer renders an object invisible. Anyone holding an affected object appears to have an empty hand, though keen eyes can spot something out of place. Use the bearer’s Sleight of Hand check result (with a +10 competence bonus) as the DC for the observer’s Spot check.

If you attack with a weapon coated with bladeshimmer, the target is considered flat-footed unless it succeeds on a Spot check to notice something unusual. A single successful attack wipes away enough bladeshimmer to end the invisibility effect.

A single vial of this substance can coat a single object or an area up to 2 feet square as a full-round action. It can’t be divided between multiple objects, though multiple vials can combine to make a larger object invisible. Each doubling of the area to be affected requires four times as much bladeshimmer (four vials for an area 4 feet square, and so forth) and takes a correspondingly longer time to apply.

Bladeshimmer has no effect on creatures⁠—​even undead and constructs cannot be rendered invisible with this substance.

Prerequisites: Craft Wondrous Item, invisibility.