Forging
The design of Ravenous Black had been inspected enough times for Leon to understand the ins and outs of Ravenous Black like it was the back of his hand.
A normal person would have had to dismantle the Ravenous Black to understand its complete design, but thanks to his divine sense, such trouble and risk were avoided.
Ravenous Black was the only Scribing Pen in his possession. If the functions stopped working as a result of his dismantling, he might just go neck himself.
The importance of a Scribing Pen was its functions, or in other words, the runes enchanted into it. The materials used to forge it was not all that important unless the designer intending for the Scribing Pen to also be used as a weapon.
Nevertheless, the materials should be decent since he was gifting the final product to his future in-laws. He needed to show some sincerity.