Copper
Quite familiar to poor folk across the world,
copper is known by spellcasters to be a magical purifier,
aiding in magic that negates sickness and poison. While its
brilliant color makes it popular for ornamental items, its
relative softness makes it unsuitable for armor or weapons
unless magically treated (which also activates its resistance).
However, it is often used in items that provide protection
from cold.
Armor made from magically treated copper grants cold
resistance 2. Items not primarily of metal are not meaningfully
affected. (A suit of chainmail is affected, while a
suit of studded leather is not.)
Magically treated copper weighs the same as steel, has
hardness 10, and has 30 hit points per inch of thickness.
Market Price Modifier: Armor +2,000 gp.