Once the System had finished absorbing the Superior Wind Vein, William brought out the necessary tools and created some sand with the Earth Element. Additionally, he spent a large amount of Mana to produce gold that would serve as a metallic oxide for the stained glass.
The requirements for the Charm Resistance Talent's Ascension were simply stained glass and a million Potential Points. It didn't specify what kind of stained glass, so William went through with the easiest method he could come up with.
With a few hours and a series of complex steps, William was able to produce a pristine shard of yellowish-brown stained glass. Even though it was his first attempt as a Glazier, the Jack Of All Trades Talent served as more than enough of a handicap to perfectly refine the glass.