Advanced Weapon System: Slash\Pierce\Blunt (paper\scissor\rock)
it would only make sense to develop a system like that to justify the great number of weapons present in this game.
Aa a general rule light armors should e more vulnerable to pierce weapons (monsters and animals getting killed with a spear) and heavy armors should be more vulnerable to blunt weapons (a heavily armored knight is unable to avoid a hit from a mace or a hammer, while an animal would probably just dodge it, because those weapons are strong but slow... would you pick a hammer or a spear to kill a lion?)
swords that are typically the best weapons should offer a good compromise but be expensive and less specialized.
As research is achieved one weapon of each kind would be offered as a choice. each weapon would have one attack value for its kind of attack for example:
WARHAMMER attack: Blunt 6
when that Blunt Weapon is used against an armor its attack should be compared to that specific kind of protection the armor offers, for example:
TROLL SKIN defense: Blunt 6 - Slash 4 - Pierce 3
Notice that a troll not having an armor is much more vulnerable to a spear or a sword than to a hammer that can more easily avoid or withstand.
In the above case there would be an attack of 6 against a defense of 6 calculated in the usual way.
SPECIAL WEAPONS:
Some specific weapons could maybe offer 2 kinds of attacks and only the most convenient should be calculated each time (swords for example can both pierce and slash, while axes can both slash and blunt)
IMO that's the combat system that makes more sense for a game like this.