PEN and PEN Ratio : PEN is an abbreviation for Penetration. This stat gives the Agent’s damage the ability to pierce through the enemy’s defense. The PEN Ratio gauges the percentage of penetration on each en Ben Bigger is a large bear in Zenless Zone Zero who belongs to the Belobog Heavy Industries Faction. Although he looks intimidating, Ben actually prefers working on mathematical problems and the company's financing. However, of course, if one decides to mess with the bear, he won't hesitate ...