The Hammer of Beginnings
At the very moment Valyr dropped the Primeval Origin Crystal on the groove he had made for it on the hammer, as if the two were made for each other, the crystal gradually melded with the Boundless Origin Alloy making up the hammer, allowing its properties to spread throughout the entire alloy.
Concurrently, the crystal slightly sunk into the hammer, allowing the still hot Boundless Origin Alloy to form a lip around the crystal, holding it in place.
For a couple of seconds, small and thin veins that had colors signifying the four basic elements covered the entire hammer, prompting Valyr to pay close attention to the forging hammer, hoping in his mind that it would be a resounding success.
Fortunately for him...
Whoosh!
At the very moment all of the veins disappeared on the hammer's surface, the forging hammer radiated a blinding silver light, covering the entire main hall in the color as the hammer started to hover off of the anvil it was on.