TREMOR SHELLS (1CP)

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.