| Rynjin |
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Living Steel might be interesting.
Some trees suck up potent minerals through their roots the same way others draw water from the ground. Though these trees blunt saws and axes used to hew them and shrug off fire, they eventually succumb to time or the elements. When properly harvested, these fallen trees produce nuggets of a metal called living steel. This glossy green metal slowly repairs itself. An item made from living steel repairs damage to itself at a rate of 2 hit points per day, or 1 hit point per day if it has the broken condition. Items not primarily of metal are not meaningfully affected by being partially made of living steel.
Armor and shields made from living steel can damage metal weapons that strike them. Whenever the wielder of a metal weapon rolls a natural 1 on an attack roll against a creature wearing living steel armor or wielding a living steel shield, the item must make a DC 20 Fortitude save or gain the broken condition. If the weapon already has the broken condition, it is instead destroyed. Living steel cannot damage adamantine weapons in this way.
Or maybe Cthonic Steel:
A scarce metal, the secret of its creation is guarded with a fatal zealousness. This material is primarily mixed with iron and is found as a natural red-orange ore amidst veins of mosaic glass. Naturally brittle, it is hardened by dousing it in a true dragon’s blood during its forging. The finished metal has a gold-red hue with an orange, reflective shine.
Chthonic steel has several valuable qualities, including ease of enchantment, its natural sharpness, and the power to absorb magic missiles. Chthonic steel always retains its edge, even when abused, granting it a +2 bonus to the critical conformation roll of any slashing or piercing weapon it is forged into. Chthonic armor and shields negate magic missile spells that target the wearer in a manner similar to the shield spell. Items not primarily of metal are not meaningfully affected by being partially made of this special material. Ammunition made from this special material has an increased market price of 15 gp per missile, armor and shields 2,500 gp, weapons 750 gp, and all other items by +500 gp per pound. Chthonic steel reduces the creation cost of magic arms and armor made with it by 10%.
Here's a list of all Special Materials
Those two above have additional costs compared to other weapons though.