Venom created from blood of Kobolds mixed with special herbs (5g).

Target must succed on saving throw 10 + CR (1/2 level) of kobold, on succesion target becomes extremly sensitive to bright light, if he targets something in bright light he has disadvantage. Target can repeat saving throw at the end of his turn.

Venom can be created from live Kobold (1d4 dmg) or taken from dead one. 1 vile can be used on 10 arrows or 2 weapons. Venom will harden and be useless after 1 minute exposed to air.