Shield Discharge

Select one model from your army equipped with
a serpent or Wave Serpent shield, then select one
enemy unit within 12". Until the end of the turn:
•That enemy unit cannot fire Overwatch or Set
to Defend.
•Each time a model in that enemy unit makes a
melee attack, subtract 1 from that attack's hit roll.
After using this Stratagem, the selected model is
no longer considered to be equipped with a
serpent shield or Wave Serpent shield.