Transhuman Physiology

PRIMARIS unit from your army is selected as
the target of an attack. Until the end of the
phase, each time an attack is made against that
unit, an unmodified wound roll of 1-3 for that
attack fails, irrespective of any abilities that the
weapon or the model making the attack may
have. If that unit contains 5 or fewer models,
this Stratagem costs 1CP; otherwise, it costs 2CP.