Bupp
Adventurer
The schtick of my blog is converting crunch from old Dragon Magazines to 5e rules. Here's an item from Dragon Magazine #91.
Oil of Phosphorescence
Potion, uncommon
A slight application of this oil will cause the user to believe that it is some other form of magical oil, generally oil of etherealness. A dose is enough oil to cover a Medium creature and the equipment it wears and carries, which takes 10 minutes.
However, when it is fully applied, your skin will suddenly start to glow as if it were aflame. This bioluminescence is permanent, and can only be negated by remove curse. The glow emitted from your body is usually a yellow-green color, and you are highly visible at night or against dark surroundings. All attempts to hide, short of covering yourself completely in blankets, hiding in another room, or going invisible, are doomed to fail. Opponents gain Advantage on all attacks against you.
http://5egrognard.blogspot.com/2014/11/oil-of-phosphorescence.html
Oil of Phosphorescence
Potion, uncommon
A slight application of this oil will cause the user to believe that it is some other form of magical oil, generally oil of etherealness. A dose is enough oil to cover a Medium creature and the equipment it wears and carries, which takes 10 minutes.
However, when it is fully applied, your skin will suddenly start to glow as if it were aflame. This bioluminescence is permanent, and can only be negated by remove curse. The glow emitted from your body is usually a yellow-green color, and you are highly visible at night or against dark surroundings. All attempts to hide, short of covering yourself completely in blankets, hiding in another room, or going invisible, are doomed to fail. Opponents gain Advantage on all attacks against you.
http://5egrognard.blogspot.com/2014/11/oil-of-phosphorescence.html