Spirit of the Martyr

Even with their dying act the Sororitas mete out the Emperor’s judgement.
While this sacred rite is active, each time a model
in this unit is destroyed by a melee attack and
does not explode, roll one D6: on a 6, after the attacking model’s unit has finished making its attacks, it suffers 1 mortal wound (a unit can
suffer a maximum of 6 mortal wounds per phase
as the result of this ability).