Potion, very rare
This seemingly harmless, pale green liquid is what keeps the master armorer up at night. Designed and brewed carefully to turn the best armor in the realm into an unwearable death trap, this poison has the unique ability to seep into metal.
When poured, smeared, or thrown on a piece of metal armor, this oil forces the wearer to make a DC 17 constitution saving throw at the start of each turn. On a failed save, the target takes 4d6 lightning damage and 4 lightning damage on a success.
This poison lasts 10 years and can only be removed by heating the metal to at least 1300 degree Fahrenheit (700 degrees Celsius).
Comments