Darkflare

Created by the drow-hunters, 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 Body 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.