Knockout Like a Boss
From Adventure Band
Unrestricted Stunt
Skill: Stealth
When you try to knock out an opponent by attacking undetected from behind with a blunt weapon (including a dagger pommel or the like), you get +2 to the attack. This can be combined with the bonus from the Backstabber stunt. The GM can rule that some creatures, such as a gelatinous cube or golem, can't be knocked out.