A Khopesh is a heavy curved blade of bronze with a cutting edge hammered to a wicked sharpness. It is an excellent hacking weapon, able to cut easily through armour and shields to sever limbs and cleave skulls.
Source: Warhammer: The Old World Online Rules Index
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A hand weapon carried by a model with this special rule has an Armour Piercing characteristic of -1.
Note that this special rule only applies to a single, ordinary hand weapon and does not apply to a model's mount (should it have one). If the model is using two hand weapons or any other sort of weapon, this special rule ceases to apply.