Weapons typically come in a standard form, being made of iron, wood, or other materials to make the weapon in question usable. Higher quality metals exist, allowing for standard weapons (such as a Longsword) to be strengthened beyond their standard uses.
Unless a weapon is a double weapon (such as a Double Sword), the weapon can only be made of one material. If the weapon is a double weapon, each side can be modified with a different material (example: one is adamantine, the other is steel).
Weight penalties can only reduce a weapon down to 0 lbs. or effectively weightless.
If a weapon enhancement lacks a price, it can be applied to a weapon when it is bought with no additional cost to the weapon.
On ranged weapons, these bonuses are applied to their ammunition.
Name: Bone
Price: N/A
Description: Weapons made from bone reduce the weight by 2 lbs. and receive the Fragile quality. Fragile makes it so that on a critical failure to-hit the weapon is considered broken and is unusable until fixed.
Name: Wood
Price: N/A
Description: Weapons made from wood receive the Nonlethal quality.
Name: Obsidian
Price: +15 G
Description: Weapons made from obsidian reduce the weight by 5 lbs., receive the Fragile quality, and the weapon receives a +2 bonus to-hit.
Name: Copper
Price: +25 G
Description: Weapons made from copper increase electricity damage dealt when channeled through the blade by 2.
Name: Bronze
Price: +350 G
Description: Weapons made from bronze reduce the weight by 4 lbs., and grant you a +1 to Persuasion checks.
Name: Iron
Price: +500 G
Description: Weapons made from iron increase the weight by 4 lbs., and receive a +2 bonus to damage.
Note: Most weapons are made from iron. Club, Quarterstaff, Garrote, Blow Dart, Sling, Nunchaku, Whip, and the Boomerang aren’t made of iron.
Name: Cold Iron
Price: +1,600 G
Description: Weapons made from cold iron reduce to-hit by -1, increase damage by +3, and gain a +4 bonus to Penetration against Magical Beasts.
Name: Meteoric Iron
Price: +600 G
Description: Weapons made from meteoric iron increase your Luck by 1 while wielded.
Name: Steel
Price: +800 G
Description: Weapons made from steel increase the weight by 6 lbs., and receive a +4 bonus to damage.
Name: Primal Steel
Price: +1,800 G
Description: Weapons made from primal steel reduce to-hit by -2, increase damage by +5, and gain a +4 to Penetration against Magical Beasts.
Name: Gold
Price: +2,000 G
Description: Weapons made from gold grant you a +4 bonus to Persuasion checks, and receive the Fragile quality.
Name: Orichalcum
Price: +1,200 G
Description: Weapons made from orichalcum increase the weight by 3 lbs., and increase your Resistance by 1 while wielded.
Name: Silver
Price: +1,000 G
Description: Weapons made from silver increase your Magic by 1 while wielded. In addition to this, silver weapons gain a +4 to Penetration against Humanoid (Lycanthropes) and Extraplanar enemies.
Name: Mithral
Price: +2,000 G
Description: Weapons made from mithral increase your Agility by 1 while wielded. In addition to this, silver weapons halve weight and increase Penetration by +4 against Humanoid (Lycanthropes) and Extraplanar enemies.
Name: Platinum
Price: +8,000 G
Description: Weapons made from platinum increase your bonus to-hit by +2k0. In addition to this, silver weapons gain a +4 to Penetration against Mystic and Undead.
Name: Adamantine
Price: +8,000 G
Description: Weapons made from adamantine increase the weight by 10 lbs., +2 to Penetration, and adamantine weapons gain a +8 to Penetration against Constructs.