Dwarven Dueling Sword

The Dwarven dueling sword is a double bladed sword. Its held in the center and gripped like a spear with the center gripping area about 5 hand sizes long and each blade about 3 feet long for a typical total length of 7 feet. It can be used as a thrusting weapon or a slashing weapon. As a slashing weapon its about as effective as a hand and a half sword but not as powerful as a two handed one or polearm due to limited leverage. As a Thrusting weapon it has good reach but not as much as a long spear. It is an effective defensive weapon due to outward facing curved cross-guards that can capture a blade, similar to a sai. Also it can be used for a quick counter attack by parrying or beating the opponents sword to the side then coming in with the other blade in the same move. It is also effective with the Cleave maneuver and an intimidating defensive attack when spun like a helicopter blade.

It cant be used with a shield since its a two handed weapon, takes up a lot of space, and can be hard to use in tight spaces or formations. However it is good at killing unarmored enemies quickly and being a threat to foes behind or above you. So its primary role is a skirmisher weapon and killing vermin.
The war sword is its own specialization of Melee Weapon skill (p. B208).

Dwarven Dueling Sword

This two handed double bladed weapon can be used to thrust like a spear, parry as a staff, or disarm like a jitte/sai. It can be used in different ways, depending on the skill. Each blade has a single edge, both edges facing the same direction which makes it easier to shift grips for longer reach or leverage as needed.
This grants +2 to parry and +1 to disarm a rigid weapon (see p. B208). It also reduces Rapid Strike penalties by 2 to -4 due to being able to used as a counter swing with the other end.
Staff, Spear -2, Polearm -4

Swing +1 cutting or crushing; Reach 1, 2
Spear, Staff -2, Polearm -4

Thrust +2 Imp; Reach 1, 2
Thrown Weapon (Spear) -1
Thrust +5 Impaling, ACC 1; Range *1/*1.5 ROF 1; Bulk -6

Weight 11 Min ST 11. Cost $2350

Sometimes tethered by a chain to a ring in the center allowing it to be pulled back like a harpoon when thrown, adds 2 lbs to weight and is typically clipped on or off as a Ready maneuver or specialty Fast Draw roll.

Standard blades are awkward to carry and enclosed in two separate scabbards so each blade requires a separate Ready maneuver to unsheathe, reduced to one with a Fast Draw roll.

When sheathed they do crushing damage.

Enchanted Variant

The typical enchantment turns the sword into a short metal rod which is the handle. On command it can expand to a single blade or double bladed version which makes it easy to carry around.

Duel Mastery

This is considered an advanced and somewhat showy style and users have typically already mastered a style such as Dwarven Guard (uses Spear). It is favored by officers who typically wont be part of a shield wall anymore and often in a flanking position where they may get attacked. It is also useful for disciplining soldiers without lethal force (using the blunt edges in staff form).

Skills: Thrown Weapon (Spear); Staff; Spear;

Techniques: Aggressive Parry; Feint; Sweep; Trip.
Cinematic Skills: Kiai; Parry Missile Weapon
Cinematic Techniques: Whirlwind Attack;
Optional Skills: Broadsword
Optional Techniques: 
Perks: Form Mastery (Staff/Spear); Grip Mastery (Dueling Sword); Sacrificial Parry (Staff); Weapon Adaptation (Staff or Spear); Weapon Bond

This post inspired by this Shadowversity post