Das steht im Normalfall bei der jeweiligen Litanei genau dabei
LITANY OF FAITH (AURA)
The Chaplain exhorts his charges to steel themselves against even the most dangerous weapons the enemy can bring to bear.
If this litany is inspiring, then while a friendly <CHAPTER> CORE or <CHAPTER> CHARACTER unit is within 6" of this Priest, each time a model in that unit would lose a wound as the result of a mortal wound, roll one D6: on a 5+, that wound is not lost.
CATECHISM OF FIRE
The Chaplain calls upon his brothers to unleash a relentless storm of close-range firepower.
If this litany is inspiring, select one friendly <CHAPTER> CORE or <CHAPTER> CHARACTER unit within 6" of this PRIEST. Each time a model in that unit makes a ranged attack against the closest eligible target, add 1 to that attack’s wound roll.