In your Shooting phase, after this model has shot, select one enemy unit hit by one or more of those attacks made with its exterminator autocannon. Until the end of the phase, each time a friendly ASTRA MILITARUM 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 phase.

While this model has 1-4 wounds remaining, each time this model makes an attack, subtract 1 from the Hit roll.