Creating a knife was not a problem for Gao Yuan, and the Arilan Moson Studio possessed a fully automated CNC lathe, so making a Steel Mace was also no issue.
Gao Yuan valued his weapons greatly, as they were critical to his survival, but at Arilan Moson Studio, he didn't need to worry about selecting steel materials.
Arilan Moson Studio had a vast quantity of bar stock, which were steel bars of various thicknesses intended for making gun barrels. Although these steel bars were not the best choice for crafting knife blades, they were more than adequate for making a bludgeoning weapon to meet Gao Yuan's needs.
So, the knife was made by Gao Yuan himself, but as for the Steel Mace, no, it should now be called a steel whip.
The steel whip was entirely milled from a steel bar. The handle was milled to an oval shape to facilitate a comfortable grip.