The functionality of Coat of Mail is to prevent overwhelms against double strength. Final Triumph overrides this functionality.
This is what I've been trying to warn people about in the DC threads... functionality and intent aren't really important, the way things are phrased is important.
Let's forget
Coat of Mail, let's look at one of my all time favorite cards:
Boromir, Lord of GondorHis text is:
Boromir is not overwhelmed unless his strength is tripled.
How would
Final Triumph work here?
Well vitality resolves the skirmish.
If victor's vit was double Boromir's, would he be overwhelmed?
The ruling on FT says:
The effect of this card changes the requirements
for resolving a skirmish. As a result, none of the
cards that previously had an effect on strength
during a skirmish have any effect on a skirmish
in which this card is played. Only cards or effects
that increase or decrease vitality directly would
alter the resolution of a skirmish in which this
card was played.
However, Boromir's text does not have any effect on strength or skirmish resolution. He just says 1 thing: "Cannot be overwhelmed" If there was any sort of way to overwhelm a companion outside of a skirmish phase, he would still be immune to it. He doesn't have any effect on skirmish resolution, he just has a "can't" effect (which I recall, always overrides can).
So it'd work like this:
Final Triumph is played.
Vitality resolves skirmish - Uruk has 4 to Boromir's 2.
Skirmish resolution, take passage from the rule book and replace every instance of "strength" with "vitality" for determining.
According to rules, Boromir is overwhelmed.
Boromir's text prevents overwhelming unless his strength is tripled.
Uruk does not triple Boromir's strength, Boromir is not overwhelmed.
EDIT: I meant to add,
Final Triumph is specified to NOT suddenly apply strength bonuses etc to vitality. So if you play a
Dagger Strike in the example above after
Final Triumph, you're not suddenly going to give Boromir +2 vitality. If those cards do not transfer from one stat to another, why would any other card do so?