Rending weapons is a category that includes the sharpest edged and pointed weapons. Whilst not massive or excessively powerful, a well-placed blow from a rending weapon can tear through any armour and make a mockery of flesh and bone.
Any roll to hit of 6 with a rending weapon will automatically cause a wound with no Armour Save possible. Against a vehicle, any Armour Penetration roll of 6 allows a further D6 to be rolled and the result added to the total score.