Redoubtable Defence

Use this Stratagem in your opponent’s Shooting
phase, when a GREY KNIGHTS
TERMINATOR unit from your army is chosen
as the target for an attack. If that unit contains
5 models or fewer, this Stratagem costs
1 Command Point; otherwise, this Stratagem
costs 2 Command Points. Until the end of that
phase, when resolving an attack made with a
ranged weapon against that unit, subtract 1 from
the Damage characteristic of that weapon for
that attack (to a minimum of 1)