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Message: <blockquote data-quote="essenbee" data-source="post: 4342185" data-attributes="member: 27478">I have limited experience with 4e but 30 years DMing, so my answers above are based on that, and upon a dash of common sense. I know that PCs and monsters to not make passive checks, as that is what "passive" means. The score is a DC that someone using an active skill has to beat in order not to be casually spotted (for Stealth) or caught in deception (Bluff), for example/I also do not allow monsters engaged in combat with a character to make active Perception checks to see if they can spot the rogue sneaking around; their Passive score would apply then. Using an Active skill implies that the monster is concentrating on using its Perception in looking for the rogue, not merely noticing him trying to sneak whilst they are busy dealing with a PC.So in the monster-in-combat situation, the monster's Passive Perception score would be the DC the rogue had to beat on his Stealth check in order not to be noticed by the battling monster.</blockquote>