A leather vest that smells vaguely of brimstone. If the attuned creature becomes immune to Fire damage, they are no longer attuned

Once the magic word is stated, Fireball is cast with a save DC of 17 on initiative count 20 until no wielder is attuned to this item. 

The breastplate and shoulder protectors of this armor are made of leather that has been stiffened by being boiled in oil. The rest of the armor is made of softer and more flexible materials.

Notes: a creature not immune to Fire Damage