Dragon Hide

I know... no one sees dragons these days and that ain't gonna change soon, but one might find a suit of dragon mail while exploring. In addition to its normal properties, dragon hide in Heroshi grants Energy Resistance 5 for the energy type of dragon it was made from. For double the cost of masterwork armor and the difficulty of attaining it, it had better have more of an incentive than "druids can wear it cause it's made of MEAT!"

Orihalcon

This material repels magic, granting SR of 18 + 1/pound of the item. It is also highly reflective, deflecting all rays, lines, cones, and even magic missile spells. There is a 30% chance of reflecting any such effect back at the caster; otherwise, it is merely negated. Check for reflection before rolling to overcome the creature’s spell resistance. Obviously, attempting to enchant an orihalcon item requires the castor to defeat its spell resistance. 

Empyrean Crystal

This material is literally from the heavens. Before the Sundering the sky was illuminated at night by a shell of empyrean crystal. When the world was sundered, much of the shell was drawn into the fissure and into the core where it was utterly destroyed by the Sphere of Darkness. The scattered remnants of the shell continued to reflect the Sphere of Light and were called stars. Physical contact with a star is comparable to being hit with a Hellball. Only by using tools made from orihalcum can one be pried from its place in the heavens or worked into weapons or shields. It is not viable as armor. A weapon crafted from empyrean crystal is considered good aligned for purposes of bypassing damage reduction and is naturally holy, even in an area of null magic. This effect cannot be dispelled or suppressed. 

Elven Steel

This specially made steel does not rust, and so is immune to the Rusting Grasp spell and the tentacles of a Rust Monster. It is 20% lighter than normal steel and has a hardness of 10. Elven weapons possess a notable asthetic in their design, bearing a smooth, elegant finish. Elven steel has a greenish tint. Items made from elven steel cost 20% more than the normal steel version.

Dwarven Steel

Dwarven steel is alloyed with titanium to make it harder than regular steel and capable of working difficult materials. It has the same weight as normal steel but has a hardness of 15. A weapon or tool made from dwarven steel treats the hardness of objects it hits as one less. Dwarven weapons are straightfoward in design, but stylized by their creator to be aestheically appealing. It bears a slightly orange tint. Items made from dwarven steel cost 20% more than the normal steel version.