My already-legendary weaponsmith got hit by a fey mood. Immediate first reaction: forbid every metal in the fort but adamantine. He takes a forge and grabs some wafers. YES! He grabs some glass and elephant leather and gets to work.
The spear that comes out of it is called The Unwelcome Desert, and depicts the foundation of the fortress it was created in. Not a desert, but you know what? My most famous military dwarf right now, Ablel Helmedbattle the Fresh Wrath of Martyrs (awesome military name btw), has ten kills, three of which are forgotten beasts. And he uses spears.
I have him dump his old weapon in my specially-designated crafts zone so I can make it fancy with some platinum and gold decorations (hell - it has 2 FB kills on it, the third belonging to Alblel's left foot) and give it to my other master-speardwarf-in-training, hopefully turning it into a named item. It's a shame you can't put gems onto any weapon but arrows, or else I'd toss some diamonds onto it as well.
I haven't checked yet, but if I can import petrified wood (his favorite material) and he turns out to bring in a lot of kills, I'm going to build a large, multi-z-level shrine for this guy underground with his coffin sitting in the middle of this massive, wide open spire with alcoves in the walls bearing petrified wood slabs with the names of those who he has vanquished carved into them. Otherwise I'll just use marble slabs.
ITT: Your perfect artifacts, and the awesome that you commit with them. No lame crap like Planepacked imitators, items made out of modded materials like Bullshittium, or other stuff. STORIES! Stuff that clicks into place perfectly, like an artifact table made from phyllite when your baron loves tables and phyllite, or items that become quasi-artifacts and get passed down from soldier to soldier. Cool stuff!