Weapons, like clothes and architecture, fall into and out of fashion. The weapons described here are what is usually used in Vastii at the time of my novel.
Knives, Daggers, Dirks
These weapons are not only common, but expected. A man walking around without a blade of some kind is just asking for trouble.
Knives are most common; commoners make their knives from rock, bone, or iron, if they can get it. Steel is prized, and knives made out of it are prized, as are very well wrought bone dirks, and they’re a common form of currency (the most common being steel coins, not for their mint, but for the material– more on that later). Handles for humans are usually made of braided rope or wood, as the cold of frozen metal still penetrates gloves.
Noblemen tend toward larger blades, and while they carry knives, they probably also carry something larger. Dirks are currently very popular weapons, while throwing knives are not common.
Swords come in a variety of styles. Because the city is underground and open space can’t be taken for granted, short swords are prevalent, and they don’t make anything approaching the size of a claymore. Stabbing is often more effective than slashing.
The common sword is shorter than a man’s arm, with a small or nonexistent hilt. The sketch of the Roman Gladius (from wikipedia) is a fairly good depiction of this style. Patrols that move along the Spiral Highway and the larger caverns often carry longer swords, taking advantage of the common short blade.
There are also much thinner swords that resemble needles or icicles than ordinarily blades. These are easy to shatter with larger weapons, however, and have fallen out of style.
Hammers, Axes, Splitting Mauls
The biggest problem with these weapons is that they require room to swing. Small axes, pick-axes, and hammers are less restricted than larger equivalents, but also do less damage to an opponent. Holding a very large hammer or axe is also considered a sign of power at the time my novel takes place in.
A splitting maul is an axe with a large blunt weight on the opposite side of the blade, which can also be used like a war-hammer. These are great for splitting large amounts of wood. They’re better as weapons of war, if there’s enough space to swing them.
Polearms have largely fallen out of style. The exception to this rule is hunting on the surface.
Tigers have adapted to the cold, and know that a warm cave entrance will likely have prey inside if it doesn’t smell of gas. Human communities (the troglodytes) fight them off frequently with long spears, cross-guarded so that a stabbed tiger is held at bay much like a boar-spear. The Mordache have taken their idea, and navigators that travel between the cities on the surface carry these weapons on their runs (traveling on a sled pulled by teams of dogs– the spear snaps to the side, and most sleds are made to hold at least two).
Polearms are also used in the arena. A troglodyte forced to fight a tiger will be given a spear and a long, curved knife made of bone.
The half-spear competes with the short sword as the weapon of choice. Fast, agile, and ideal for stabbing forward, the spear is an aggressive weapon and is associated with speed and cleverness.
The rise of the crossbow was the downfall of the throwing knife. Currently, crossbows are made in several styles. Large crossbows hold bolds an inch in diameter and come with gears to wind the string back in the mechanism. Small crossbows hold much thinner bolts, and can be held in one hand and loaded more quickly.
Ordinary crossbows are made for short range. Since the limit of its use is dictated by the available light, most are not accurate at long ranges.
There is a specialty crossbow that is designed to hit far targets. It requires a second machine to draw its string back, since it puts several hundred pounds of force on the draw. The bolts are very long, carved special. These are hard to find, expensive, and illegal; they’re primarily used for assassinations, aiming at a lit target from over a long distance.