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Adamantine was a dark metal nearly black in colour. When polished adamantine had a green sheen when viewed by candlelight or a purple-white sheen when viewed by magical light. It was a very rare metal only found in the deepest reaches of the World Cavern or even more rarely, in small meteorites that rain down from space.

Adamantine was highly prized by dwarves and giants who generally relied on the metals resilience to create weapons and armor that could withstand the stresses of use by such a titanic figure.

Adamantine, when smelted, was ultra-hard but this was a costly procedure. Adamantine weapons were useful for damaging the weapons and armor of opponents. A set of adamantine armor or a shield was nearly impenetrable to normal weapons.

Weapons

  • Adamantine can only be applied to weapons that are primarily made of metal such as swords and axes.
  • Adamantine weapons lose the Finesse and Light property.
  • Can only be destroyed by magic or special forges that can craft such a weapon to begin with.
  • +1 to Damage Rolls.
  • Adamantine weapons bypass the critical resistance of adamantine armor
  • Is a magic weapon for purposes of overcoming resistances.
  • An adamantine weapon deals an additional weapon die in damage when attempting to sunder an object.

Ammunition

  • Can only be destroyed by magic or special forges that can craft such a weapon to begin with. Adamantine arrows and bolts still run the risk of breaking on hit, but the arrowheads can be recovered and reused. 
  • +1 to Damage Rolls.
  • Adamantine weapons bypass the critical resistance of adamantine armor
  • Is a magic weapon for purposes of overcoming resistances.

Armor

  • Any medium or heavy armor (except Hide armor) can be made out of adamantine.
  • While you're wearing adamantine armor, any critical hit against you becomes a normal hit.
  • Can only be destroyed by magic or special forges that can craft such a weapon to begin with.

Shield

  • While wielding an adamantine shield you can add your shield’s AC bonus to any Dexterity saving throw you make against a spell or other harmful effect that targets only you.
  • Can only be destroyed by magic or special forges that can craft such a weapon to begin with.

Adamantine weapons, armor, ammunition and shields can be forged by only master craftsmen.

Item Type Cost Modifier Strength Requirement Weight Modifier
Ammunition +50 gp - x2
Light weapon +250 gp + (500 gp per pound) - x2
One-handed weapon +250 gp + (500 gp per pound) Str 14 x2
Two-handed weapon +500 gp + (500 gp per pound) Str 17 x2
Medium Armor +500 gp + (500 gp per pound) Str 15 x2, Gain Disadvantage on Stealth checks
Heavy Armor +1000 gp + (500 gp per pound) +2 x2
Shields +250 gp + (500 gp per pound) Str 14 x2