One of the most important parts of being a Hero is to keep your weaknesses hidden. Usually, the facial expressions made during a fight tell the opponent what's effective and what isn't. To keep them guessing, it's important to refrain from using emotions (except anger). That's where the Poker Face comes in. This handy mask allows the wearer to keep a straight face during the fight. By doing so, the monster/enemy has no clue what's effective.This type of protection is most handy against melee fighters. Wizards can simply use magic to find the hero's weaknesses.