It makes sense(to me at least)that they would probibly put a blade at the end of a crossbow so that it could act as a melee weapon.
What say you all?
Also,what sort of magic item would this contraption make?
bumpy-bump
There are a few problems I see with this
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A crossbow is actually quite delicate. It is a piece of precision tooled wood. I know from personal experience that a few minor scrapes bumps and knocks can utterly hammer accuracy. Secondly an axe or heavier sword might utterly destroy the mechanism. Crossbows may be chepa comapred with training a longbow man, but they're certainly not cheap.
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They are quite cumbersome devices, they wouldn't neccessarily make the best melee weapons. The Bayonet (which I think is your inspiration) makes a gun into a spear. Essentially turning one weapon into another tried and tested weapon. These are smaller, clumbsy and unweildy. They would fight as well as bricks would fly.
That being said, if a verditius (or similar) wanted to make a special project of reinforcing these items into being capable of taking weapon blows then they could be feasible. But to be Honnest, they would be better off just carrying a large knife, or short sword.
Any story idea that might come from this?
Quite a few actually
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Finding someone of the relevent skill to make the device and what will they want in return
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Looking for Historical roman (or equivilent) designs for 'inspiration' However this could be in the hands of another rival covenant, a covenant who is friendly but will want favours, under the clawed clutches of a dragon, in a regio which is full of roman (or equivilent) 'ghosts' defending against the 'invaders' who make it through into the regio.
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Finding someone who knows how to devise a style of combat with the device.
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The Church's prohibtion on the use of Crossbows against christians under canon 14 of the 2nd Lateran Council. Although not massively enforcable, a zealous churchman or a churchman with a grudge may take umbridge or seem to take umbridge at this for genuine zeal, political edge or just to be a nuisance.
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industrial espionage. Spying design theft and sabotage from rival craftsmen (if it's made by exceptionally gifted mundae crafters.)