HEAVY WEAPONS: Heavy weapons, such as those made from gold or platinum, are unwieldy but inflict additional damage. Without the proper Exotic Weapon Proficiency feat (for instance, heavy longsword), you suffer a –4 penalty on attack rolls with a heavy weapon.
Only weapons made entirely or largely of metal (such as swords or axes) are affected; other weapons (such as spears) are not. A character can wield a heavy weapon one size category smaller than his own in two hands to avoid the attack penalty. For instance, a human swinging a light mace made of gold with both hands, or an ogre wielding a platinum longsword with two hands, does not suffer the attack penalty.
You can never use the Weapon Finesse feat with a weapon made of heavy metal.
Weapons made of heavy metal inflict increased damage, as shown in the following table:
Old Damage (Each Die) = New Damage
1 = 1d2
1d2 = 1d3
1d3 = 1d4
1d4 = 1d6
1d6 = 1d8
1d8 or 1d10 = 2d6
1d12 = 2d8
