Primordials, as they are an intrinsic part of this world, can not be harmed by anything of this world. Any weapon our smiths could forge would shatter instantly upon a Primordial’s hide. No blade, no matter how finely crafted or powerfully enchanted, could ever manage to cut a Primordial’s skin. Arrows crafted from the finest elven wood would merely bounce off their ancient flesh. Even our most powerful mages could not craft a spell strong enough to affect them. Nothing of or from this world could harm them.
Yet starstones were not of this world. They came from the blackened void beyond the skies, up in the deep dark where the stars were known to burn. These celestial stones would fall to the earth every now and then, looking bright and colorful as they streaked across the night sky.
Before the Crusades, starstones were not considered valuable. They were not pretty as precious gems were, nor were they useful in forging like rare metals. Their appearance was that of an ordinary rock, which was quite the betrayal of their cosmic origins. Common folk often collected them as novelties, though there were some learned mages who were known to study these unearthly stones for academic reasons.
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Today, starstones are worth twice their weight in gold. During the start of our Crusade, there was a great undertaking by the royal councils to purchase (and in some cases, confiscate) as much starstone as we could get our hands on. Entire kingdoms’ coffers had been drained dry in the mad rush to collect as many of the celestial material as we could. Thousands of smiths had become tasked with turning the stones into the most formidable weapons that they could craft. This turned out to be a very difficult undertaking since starstones, despite their unearthly origin, still remained what they were: stones. Each was soft, brittle and did not make the best of weapons. Blades and axe heads made from them were often useless against most anything that walked our world.
Anything except for the Primordials, of course.
Thus, only a rare few swords, daggers, and axes were made from the material, and those were given to the kings and generals who would lead the united army. The vast majority of the stone was converted into arrowheads and spear points to be distributed among the rank and file.
More conventional weapons of iron and steel made up the bulk of the grand army’s arsenal, as those would be of more use to our soldiers in their battles with the numerous foul creatures that served the Primordials in their vile dens.
The starstone weapons themselves would be reserved in the fight against their masters.
~Excerpt from King Vardin of Ispara's journal entry, writing about how starstone equipment was used during the Second Crusade.