Armor vs. Protection - question of piercing and negation

[Stormbinder]

Originally posted by tinkthank:

quote:

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Originally posted by Sheap:
The unit receiving damage has an aggregate protection value which is based on both its natural protection, and its armor/magical protection. If the unit has a lot of natural protection then the total protection will not be the sum, but rather computed by the formula in the FAQ.

The armor piercing/negating weapon will reduce this aggregate protection rating by 50% or 100%, respectively, before trying to do damage.

Of course in many cases even an armor piercing weapon will not do any damage (i.e. standard crossbows vs. ulmish knights for most dice outcomes). But an armor negating weapon will almost always do damage if it hits.

When will an armor negating weapon NOT do damage if it hits?

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When you get really unlucky. There is still open ended d6 involved, even when you have zero protection from armor dur to AN damage.