Wondering if brother corbulos ability (Red grail) Grant an additional attack on a 6+ to hit would stack with (if playing against chaos) vengence of sanguinus, generate an additional attack on 6+ to hit if fighting against heretic astartes.. seeing the combo could be broken if used on death company with thunder hammers ... but a lot of fun haha (My feeling is it would stack, but fairness tells me its the same ability so wont stack)