Sicarian Ruststalkers

If every model in a unit has this ability, then each time a ranged attack is made against it, subtract 1 from that attack’s Hit roll.

At the start of the battle round, you can select one of the Doctrina Imperatives below. Until the end of the battle round, that Doctrina Imperative is active for your army, and all units from your army that have the Doctrina Imperatives ability gain the relevant abilities shown below.

PROTECTOR IMPERATIVE
■ Ranged weapons equipped by models in this unit have the [HEAVY] ability.
■ Improve the Ballistic Skill characteristic of ranged weapons equipped by models in this unit by 1.
■ Each time a melee attack targets this unit, if this unit has the Battleline keyword and/or it is within 6" of one or more friendly Adeptus Mechanicus Battleline units, subtract 1 from the Hit roll.

CONQUEROR IMPERATIVE
■ Ranged weapons equipped by models in this unit have the [ASSAULT] ability.
■ Improve the Weapon Skill characteristic of melee weapons equipped by models in this unit by 1.
■ Each time a model in this unit makes an attack, if this unit has the Battleline keyword and/or it is within 6" of one or more friendly Adeptus Mechanicus Battleline units, improve the Armour Penetration characteristic of that attack by 1.