Nerds come in a lot of flavors, and many of us double dip. Blacksmith tabletop gamer? A natural combo. Even if you don't personally have a high elf alter ego or a dogeared copy of the Players Handbook, you might appreciate the wholehearted creativity that D&D and similar pastimes can prompt. For your viewing pleasure, consider this step by step on forging the iconic 20-sided figure from hot steel.
1:00 to start, 4:30 lumpy-golf ball stage, 7:45 for engraving, 10:20 for "testing"
Blacksmith Gil Ramierez, a.k.a. the Vlogsmith, does a nice job at showing the tools and method, while also illustrating the practiced eyeballing (and burritos) the process demands. Like most simple-looking things, a geometric shape is tricky as hell to actually create by hand...particularly with steel.
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This labor intensive die was first created as a gift, and I'd bet several GP it was a critical hit. Gygax would probably approve.