Scorpion's claw and chainsword

Each time a friendly operative fights in combat with this weapon, in the Resolve Successful Hits step of that combat, your opponent can only parry with critical hits.

Each time a friendly operative fights in combat or makes a shooting attack with this weapon, in the Roll Attack Dice step of that combat or shooting attack, your attack dice results of equal to or greater than x that are successful hits are critical hits. x is the number after the weapon's Lethal, e.g. Lethal 5+.