Most Greysparks are shortswords — some are daggers — and none have been created, to date, any larger, though the idea’s been bandied around. All bear the same look, more or less: a hilt of porcelain over hardwood, slim and sporting the merest hint of a guard or shoulder, a smoothly grey-gold glassy dome for a pommel-nut, and a slender twin-edged blade that tapers to a fine needle tip.
A blade that is — or at least looks — perpetually vibrating, so finely and so fast that the shape of it looks to be blurry and indistinct around the edges.
* Surprisingly, perhaps, touching a Greyspark’s shivering blade is not a surefire way to lose a finger. In fact, the sword can cause no harm at all to anything of living tissue or organic nature, or even more esoteric beings such as elementals. (It does tickle, though.)
However, wielding such a blade against any form of clockwork, constructs, or otherworldly metallic- or otherwise-forged entities is a whole different story — against such mechanized foes a Greyspark inflicts double damage and forces its victim, for its first successful wounding, into a shuddering halt as its internals stutter and glitch, losing its next two actions.
Some Greysparks also ignore mechanicals’ armour as well; or, more commonly, can cast a sizzling sparkbolt one to four times a day, dealing normal damage as a ranged attack up to 60′.
* All Greyspark blades stem from the same source: the hidden foundries of the Grey Guild, who fight from shadow and fen, alley and market, against the creeping tide of the Steel Wave March that the Emperor of Porcelain and Steel sends across portal after gleaming portal to harvest the land and its people. The Guild has found weaknesses in the warbling warrior constructs, and they gladly share with any who join the fight.