Matoyasite
This crystalline substance is easily mistaken for common glass, and is known by some as “sightstone” due to its unique qualities. The easiest way to tell the difference between it and glass is to hold it to light; where glass will be more likely to divide the light as a prism, matoyasite simply appears to absorb it, causing cloudy whiteness to form inside it. It is a native Porphyran stone, and is never found anywhere near porphyrite; it is, ironically, completely absent from the mineral-rich Creeper’s Rift. It is found in significant quantities only in Nor-du-Mag, making it difficult to obtain, but small pockets are found in strictly Porphyran mountain ranges.

Orbs made of matoyasite, appear to be completely translucent when outside of direct light. False diviners have been known to use matoyasite crystals set upon a hole in a table and cast light cantrips underneath to take advantage of this property while telling fortunes, but those familiar with the material will be likely to recognize the trick.

An unusual trait this substance bears - and one which makes its use by fake fortune tellers all the more ironic - is its ability to become “ensouled.” Far more than any other substance, an object made of matoyasite can gain its own will and intelligence, though the process by which this occurs is still unknown. Some speculate that it’s actually composed of countless creatures that bond into a gem-like form when dormant, and magical energies awaken them, while others believe sightstone is able to absorb the souls of beings when it’s used for divination and necromancy. A few believe them to be immature crystalline horrors, or the remains thereof. In addition, matoyasite is strongly linked with sight, and can both provide and take it away from others. Matoyasite that has not become ensouled holds the same sight-related qualities as ensouled matoyasite does, although ensouled matoyasite is active about using them. This material is very popular with witches - particularly those who focus on divination magics - though spellcasters in general also enjoy its benefits.

Matoyasite can be used to craft melee and thrown weapons which deal slashing or piercing damage as well as arrows and crossbow bolts, being broken into sharp slivers or arrowheads much the way obsidian is, but because it’s so fragile and is found in relatively small amounts, it’s not particularly useful as armor, and bullets for both slings and firearms shatter harmlessly on impact, making matoyasite useless for their construction. When one strikes with a matoyasite weapon or ammunition, they gain a brief glimpse at the world through the eyes of the creature they hit, granting the user an insight bonus to AC against that creature equal to 1 + the weapon’s enhancement bonus for 1 round. The target must succeed a Will check (DC = 15 + the weapon’s enhancement bonus) to avoid this effect. When a weapon made of matoyasite is sundered (whether or not it is broken or destroyed), the creature that struck it must succeed a Will check (DC = 10 + the weapon’s enhancement bonus) or be blinded for 1d4 rounds as the shattering crystal drains away their eyesight. Witches and other spellcasters have a powerful bond with matoyasite equipment; witches add ½ their caster levels to the DCs of effects of matoyasite weapons, while other spellcasters add ¼ their caster levels.

Non-magical matoyasite weapons and ammunition gain the fragile quality and are always masterwork. They have half the base hit points of normal equipment of the same type, but despite their fragility, are quite difficult to shatter, possessing half again as much hardness if constructed properly. Weapons made of matoyasite cost an additional 2,500 gp, while ammunition costs an extra 45 gp per item (this includes the cost to make the weapons masterwork).