Wolfgang takes the awl in one hand and Michael's in the other, and then puts those two things together. The tip of the awl presses into the center of one of his fingerpads. There's a light pinch, and then Wolfgang holds his finger over the egg and waits for one drop to fall on it. It stains the shell.
Immediately they drop his hand and the awl and tap the hammer directly in the center of that red drop, and the egg cracks and splits in two. Inside it's dry and empty except for a round, slightly translucent black stone of some kind, roughly the same size and shape as a yolk. The whole thing is perfectly smooth, as if cut by a machine.
Wolfgang puts that magnifier on their head, pulling the lenses down over their eyes, and leans over it, tipping it this way and that. “Huh.” They reach for the awl again, holding it in their left hand as they start to gently carve into one side of it, producing a series of strange figures or runes consisting of straight or curved lines capped with small circles. It takes a while; they're completely absorbed with this.
After they put the awl down and blow away a small amount of blackish dust, they dig in their box for a few more tools — a small handheld drill, which they use to make a hole in the top and loop the silver chain through it. They fiddle with the ends of the chain, using the pliers and hammer to install a clasp at the ends.
Finally at length they lean backwards, tilting their head back and forth as they examine what they've done. Then they look up, grasping the amulet by the stone to hand it towards him. They're still wearing those magnifiers and it makes them look like some bizarre steampunk mad scientist. Turns out their eyes are blue, not black. “Try it.”