Transhuman Physiology

Use this Stratagem in any phase, when a
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.