The Blade Well Pierced

Use this Stratagem in the Fight phase, when
a CULT OF STRIFE INFANTRY unit from
your army is selected to fight. Until the end
of the phase, each time a melee attack is made
by a model in that unit, improve the Armour
Penetration characteristic of that attack by 1.
The Cult of Strife teaches that no armour is
inviolate. So it is that these fighters strike at
visors, eyes and armour joins with hard-won
skill.