I have never used the Piling On skill. I would like to check how it works if possible.
Am I right in thinking that you can reroll either the armour roll or the injury roll (but not both)? When do you have to decide to use the skill? Is it as soon as you decide to reroll?
I merely ask because I did some maths on my blog and found it far stronger than mighty blow, to the extent that I can't see why I shouldn't take it first on my killer pieces.
Many thanks for your help