Slayer of Nightmares

-Use this in the fight phase, when a
Custodes unit is selected to fight. Until the
end of the phase, each time a model in that
unit makes an attack against a unit with a
high Toughness than its own, add 1 to that
attack's wound roll. If the unit contains
three of fewer models, this Stratagem cost
s 1 CP, otherwise, its 2CP.