HELLFIRE SHELLS

Use this Stratagem in your Shooting phase, when
an ADEPTUS ASTARTES INFANTRY model
from your army shoots with a heavy bolter, a
hellstorm heavy bolter or an executor heavy bolter.
You can only make one attack with that weapon
this phase, but if a hit is scored, the target suffers
D3 mortal wounds and the attack sequence ends
(if a hit is scored against a M ONSTER unit, that
unit suffers 3 mortal wounds instead ofD3).