Adrenal Surge

WHEN: Fight phase.
TARGET: Up to two Tyranids units from
your army that are within Synapse Range
of your army and are eligible to fight, or
one other Tyranids unit from your army
that is eligible to fight.
EFFECT: Until the end of the phase, each
time a model in one of those selected
units makes an attack, a successful
unmodified Hit roll of 5+ scores a
Critical Hit.