Rasta said:
I like the RQ3 system, where the defender can damage the attacker's weapon on a failed attack, with a successful parry, also disarming him on a critical parry.
Actually there is a considerable difference between blocks and parries/wards. The former basically interjects the weapon/shield directly in the path of the attacking weapon. The latter involves deflection of the attacking weapon off-line, sometimes in combination with footwork, which doesn't expose the parrying weapon to the same forces.
In many of the medieval fighting manuals it is expressly stated that you should never
block with the edge of your blade, since it exposes the weapon to damage. You should be parrying with the flat of the weapon, not its edge.
In fact when such blocks occur,
both weapons usually end up being chipped or dented.
I like a greater chance for weapons to get damaged. Seems more realistic, and makes people spend more of their hard earned money on repairs, unless they can fix it themselves of course. It also puts a greater emphisis on having secondary weapons. (ya gotta use that dagger sometime right?)
Unfortunately, using your weapon damage rules would make weapon lifespan highly unrealistic. The average weapon would break once every combat session or two. A somewhat excessive breakage rate.
In reality, it is rare for a weapon to break. It's not impossible, but usually its due to poor metallurgy or diabolical fighting technique, rather than a flaw in the design of the weapon itself *.
What normally occurs is what I described above, where bladed weapons lose their edges, preventing them from inflicting so much damage. One of the Viking Sagas records a battle where one side were fighting in chainmail byrnies. The swords of the defenders became so beaten up that they couldn't harm their armoured opponents, and rushed to a chest full of fresh swords, which they used to turn the battle. The blades didn't break, they just lost their cutting ability.
Of course this doesn't work with mass weapons such as maces, hammers or poleaxes, which are effectively indestructible on the battlefield.
Even when attacking a weapon directly it is difficult to actually inflict serious damage upon it. Axe versus spear? Go out in your back garden and try it!

You'll find its neigh impossible to break a hafted weapon unless it is braced (or trapped) against something solid. Most of the striking force is dissipated when the attacked weapon is knocked to the side.
Of course shields are something different, since they are braced against the body/arm of the defender, and thus can be damaged much more easily. They are also normally made of thin wood and leather (sometimes with bits of metal for extra protection) so as to be light(er) in the hand, and hence far more vulnerable than a weapon. Again, the Viking Saga's describe duels where the objective was to smash your opponent's shield(s) to pieces before hitting the man behind it.
This is however a game and if you want fragile weapons you can have them. But historically (at least by the late middle ages), such breakages were rare.
Have fun!
Pete
* - From the prevalence of historical records and gradual changes in their fighting style, there are some weapons which seem
slightly more prone to breakage than others. Japanese katana's and renaissance period rapiers especially. The latter are very narrow blades which became designed more for fashion than practicality (hated by old weapon masters such as George Silver), and were used more for thrusting and parrying thrusts, than against heavier, more solid weapons. Katana's are edged weapons specifically designed to slice with razor sharp yet fragile edges, since few opponents used heavy armour except sometimes on the battlefield. They too became lighter, narrower for more 'civilian' use, and thus more vulnerable. In fact one of the reasons why Miyamoto Musashi is said to have used a wooden sword in later years might not have been his growing desire for peace, but the tactical consideration that wooden swords are sometimes actually
more resistant to damage than a katana!