TREMOR SHELLS

Use this Stratagem in your Shooting phase,
when selecting a target for a THUNDERFIRE
CANNON model from your army. Until the
end of the phase, each time that model makes
a ranged attack, 'subtract 1 from that attack's
wound roll, and, if a hit is scored against a
target that is not TITANIC and cannot FLY,
then until the start of your next Movement
phase, halve the Move characteristic of
models in the target unit and subtract 2 from
Advance rolls and charge rolls made for that unit.