Achilles Ridgerunners

The bearer’s unit has the SMOKE keyword and you can target it with the Smokescreen Stratagem for 0CP.

The bearer’s ranged weapons have a Ballistic Skill characteristic of 3+.

Each time the bearer’s unit has shot, select one enemy unit that was hit by one or more attacks made by the bearer this phase. Until the end of the phase, each time a friendly GENESTEALER CULTS model makes an attack against that unit, that attack has the [IGNORES COVER] ability.

in your Shooting phase, after this unit has shot, select one enemy unit hit by one or more of those attacks. Until the end of the turn, each time a friendly GENESTEALER CULTS unit makes an attack that targets that enemy unit, improve the Armour Penetration characteristic of that attack by 1. The same enemy unit can only be affected by this ability once per turn.