Daniel U. Thibault
If an enemy has an ability that enables it to target multiple heroes (e.g., Dark Stone Brutes Crazed ability), does the enemy make one combat roll that affects all targeted heroes, or does it make a combat roll for each targeted hero?
I'd treat it like any other area effect, like Dynamite: "When the Dynamite explodes, it does D6 Wounds, ignoring Defense, to each model in the same and adjacent spaces to it. Roll the Damage for each model separately."
Roll separately for each targeted Hero.