MERCY IS WEAKNESS

TARGET: One ADEPTUS ASTARTES unit
from your army that has not been selected to
shoot or fight this phase.
Until the end of the phase, each time a model in
your unit makes an attack that targets a unit that
is below its Starting Strength, that attack has the
[SUSTAINED HITS 1] ability, and when making
such an attack, if the attacking model is a
VEHICLE, a successful unmodified Hit roll of 5+
scores a Critical Hit.