Darkflare

Source Pathfinder Chronicles: Faction Guide

Created by the drow-hunting Lantern Bearers, this alchemical flare explodes in black sparks 1 round after lighting. Any creature in the same square as a darkflare when it explodes must make a DC 15 Fortitude save or be unable to see with Darkvision for 1d10 rounds. Affected creatures can still see in normal light with no penalty. A darkflare has no effect on creatures without Darkvision. The DC to create a darkflare with Craft (alchemy) is 20.