Platinum
This silvery-white metal superficially resembles
aluminum but is extremely heavy. Because it is
so malleable, it must be magically altered to the rigidity
of steel so it can maintain its shape even when used in
combat. This process also catalyzes its magical properties.
The following information refers to magically
treated platinum.
Armor made from treated platinum grants cold and
sonic resistance 2. Platinum armors are one category
heavier than normal for purposes of movement and
other limitations (for example, whether a barbarian can
use his fast movement ability while wearing the armor
or not). Light armors are treated as medium, and
medium and heavy armors are treated as heavy. Spell
failure chances for armor and shields made from platinum
are increased by 10%, the maximum Dexterity
bonus is decreased by 2 (which may bring it below 0),
and armor check penalties are increased by 3. Armor
not primarily of metal is not meaningfully affected. (A
suit of chainmail is affected, while a suit of studded
leather is not.)
Platinum weapons are considered heavy weapons.
Magically treated platinum weighs twice as much as
steel, has hardness 10, and has 30 hit points per inch
of thickness.
Item - Market Price Modifier
Armor - +5,000 gp
Weapon damage up to 1d3 - +1,500 gp
Weapon damage 1d4 or 1d6 - +2,500 gp
Weapon damage 1d8 or higher - +7,000 gp