Adamantium

The most well known of magical metals and the most feared and for good reason. Adamantium can easily be recognized by the slight blue glow all weapons and armor emit when exposed to sunlight. These weapons and armor were extremely strong and valuable. Adamantine weapons also contained an innate magic nature which was able to absorb and store enormous amounts of magic, far more than normal steel and other magical weapons. The downside was it was really hard to enchant and really hard to craft these weapons and armor due to their explosive properties. There was once a sword made out of pure adamantium which is extremely reactive compared to non-pure adamantine. The weapon itself fell into the hands of a person known as The Original Sinner and it was used back during "Project Assiah" and again during the Collapse of the Inferno. The Legends ended up being true as this weapon was capable of Slaying gods as it was used to kill Asmodeus which in turn destroyed the Infernal Plane.

Out of fear of recreating another weapon those back in "Project Assiah" banded together and came to an agreement to ban the metal and destroy all the forges. Even the lawless agreed to ban the metal itself. Adamantium is still prohibited by most however only few are allowed to wield the powers of adamantium. Certain Slayers known as Anglers are allowed to wield Adamantium weapons and have Adamantine Armor as they use this to aid tracking down and damaging Adamantium Slayers. Despite Anglers being allowed to wield Adamantine, forges are still being destroyed and the metal itself is extremely scarce as almost none it is being made only those smiths that break the order make the metal itself. Back during the dwarven experiments there was one experiment that Dwarves were doing that is rumored to purify adamantine making it highly reactive once again despite the metal originally not being pure.