On page ten of the rulebook, there is the rule:
If there is more than one Enemy that attacks by Strength on a space and they have the same encounter number, they fight as one during battle, adding their Strength together with just one attack roll to make a single, combined stack score.
Does this rule still apply if a player encounters two or more enemies that attack by Craft? What if one enemy attacks by Strength, but the other attacks by Craft?