Negative armor/shields/resist?

[Darastrix Ith]

So the damage formula is:
final dmg = ability dmg x (0.9^((armor + shields + resist) - weakness))

Clearly from this formula the most amount of dmg you can do is times 1 dmg or true dmg, my question is can a unit have negative armor/shields/resist?

Let me specify.
Example: a unit has 2 armor and 0 shields and your unit has shield breaker module (which lowers shields by 2 per attack), will that enemies shield go to -2 or stay at 0?

I presume resist can go negative cause of all the effects such as broken mind (stack limit of 5), charred (does it have a stack limit?) and others. But where can I see resistances of units?

 

[Ethorin]

most units don't have resistances but when they do they show up right below the active abilities in the unit card, personally I rarely bother to check because there's a damage preview when I mouse a valid target. I'll check if I can plan what damage channels I can take into a fight but if all I have available is one damage type I'm probably packing some sort of resistance dropper anyway.

 

[HousePet]

Resist can be negative. Armour and Shields cannot.