Chapter Master

Use this Stratagem before the battle if your army
does not include a CHAPTER MASTER model.
Select one ADEPTUS ASTARTES CAPTAIN
model from your army that is not a named
character. Replace that model's CAPTAIN
keyword with CHAPTER MASTER and replace
its Rites of Battle ability with: Chapter Master:
You can re-roll hit rolls for attacks made by
models in friendly < CHAPTER> units whilst
their unit is within 6" of this model