Martial
Trick Weapons
Trick
weapons are clever inventions designed by the members of the
Incendiary Guild. They are called “trick” weapons because each
weapon can be transformed in the heat of battle to provide its
wielder with an expanded array of options with which to fell the
horrific beasts that haunt Krevborna. Trick weapons are rarely sold
to private individuals; rather, they are either bestowed upon those
who have proven themselves to be allied with the Incendiary Guild or
passed from one hunter of the dark to another.
Weapon
Properties
Combo.
On a critical hit with this weapon, you deal the damage listed
for the combo property of its current mode instead of rolling double
damage dice. You choose the damage type of a critical hit from a
weapon with the combo property from the types of damage it is capable
of dealing. For example, a critical hit from a lashing cane can deal
either bludgeoning or slashing damage.
A
weapon with a ranged transformed mode can only deal extra damage from
its combo property in melee combat; a critical hit that occurs
outside of melee range deals critical hit damage as normal. For
example, a critical hit from an arrow fired from a yeoman blade in
its transformed mode deals 2d6 piercing damage. A critical hit with a
trick weapon with the ammunition property must expend one piece of
ammunition to deal its combo damage.
Transform.
You can use a bonus action to transform a trick weapon from
its normal mode to its transformed mode or from its transformed mode
to its normal mode. When you attack with a trick weapon, you use the
damage and properties of its current mode.
Nicely formatted pdf here.
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All of the above was inspired by the weapons in Bloodborne, of course. If you need image inspiration, it probably plays out like this: beast saw = whirligig saw, church hammer = kirkhammer, duelist rifle = reitterpallasch, internment blade = burial blade, kirk pick = church pick, lashing cane = threaded cane, serrated cleaver = saw cleaver and beast cutter, stalker axe = hunter axe, temple blade = Ludwig's holy blade, warden pike = rifle spear, wild claw = beast claw, yeoman blade = Simon's bowblade.