Nightsight Poison

History
Considered a utility more than a poison, this poison allows the affected creature to gain the ability to seen in the dark. It is made from a special spider silk sac, found in the abdomen of giant spiders. A single spider silk sac is only good for one use.

The Nightsight Poison first produced by a young human named Carden Noll in the year 711 AW. He came from a small town called Wharram. He credited the invention of the poison to a half-ling named Cade Burrows, a member of a group of mercenaries working for The Black Shield. According to Carden Noll, Cade Burrows showed him how to brew the poison to help the militia guards see better during the spider attacks on Wharram in 711 AW.

Ingredients

 * Spider Silk Sac
 * Alcohol base
 * Water
 * Empty vial

Steps

 * Add alcohol and spider silk sac to pot
 * Boil roughly 15 minutes or until a sticky paste, stirring gently
 * Remove spider silk sac and allow to cool down for 10 minutes
 * Add 1 cup of water and stir for 5 minutes
 * Empty contents of pot into vial

Game mechanics
A creature who drinks the potion is granted the effects of Darkvision for an hour. The affected creature builds up a poison residue in his system which can only be reset by a long rest. For each potion used after the initial potion, the creature has a stacking 10% increased chance of being Blinded for a day. Roll percentile dice to determine if the creature is blinded. Example: John drinks his first Nightsight potion and can now see in the dark for 1 hour. After a hour he drinks another Nightsight potion. John now has a 10% chance of being blinded for 24 hours. If he chooses to drink another Nightsight Potion, he now has a 20% chance of being blinded for 24 hours.