Blue Horrors

Each time a Blue Horror model in this unit is destroyed, after the attacking unit has finished making its attacks, if this unit is not destroyed, roll one D6 for that model. On a 4+, add one Brimstone Horror model to this unit.

While an enemy unit is within 6" of this unit, if this unit contains one or more Blue Horror models, worsen the Leadership characteristic of models in that enemy unit by 1.

Each time this unit is selected to fight, you can select one enemy unit within Engagement Range of it, then select one or more Brimstone Horror models in this unit. For each Brimstone Horror model you select, roll one D6: on a 4+, that model is destroyed and that enemy unit suffers 1 mortal wound.

While a friendly Thousand Sons Psyker unit is within 6" of and visible to this unit, models in that unit have a 4+ invulnerable save against ranged attacks.