Methodical Annihilation

use this stratagem in your shooting phase, when an Iron Warriors unit from your army is chosen top shoot with .
select one of the following effects to last until the end of that phase:
.when resolving an attack made by a model in that unit, you re roll the damage roll.
. you can re roll any or all of the of the dice
to determine the type characteristic of weapons that models in that unit are equipped with.