Talk:Badge of Courage
It seems that the mind spell immunity might be a bug, a technical error of the game. For example, if the Berserk spell is cast on a creature stacks of a hero equipped with Badge of Courage, the spell's drum symbol appears but when the spell is cast it does not take effect. This seems more a techical error, than designed property.
Badge of Courage's +1 to morale effect is a solid enchancement, but with the mind spell immunity the badge becomes almost superior. As can be expected, Badge of Courage is quite useless for Necropolis heroes, as undead are unaffected by morale as well as mind spells.