Potion rare
This slate gray potion looks like sheets of folded metals while still, but swirling it slowly changes it into a gray slurry. When you drink this potion, your skin begins to harden and seemingly becomes glossed over with a metallic wash. Your Armor Class is increased to 18 if it is less than that, else your Armor Class is increased by 1. This potion’s effects last for 1 minute.