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Message: <blockquote data-quote="KarinsDad" data-source="post: 6473791" data-attributes="member: 2011">If the foe does not suspect that you are there:-5 on passive perception vs. StealthIf the foe does suspect that you are there:Perception vs. StealthIf the invisible creature is attempting to sneak through a room full of unsuspecting foes:-5 on group passive perception vs. Stealth and half or more of the foes have to succeedThe logic behind this is that the more foes are there, the more that they would attribute unexpected sounds to each other. The jingle of armor. That's Fred over there. The creak of a floorboard. Barney shifted position.If the invisible creature is attempting to sneak through a room full of suspecting foes:Perception vs. Stealth and any one foe has to succeedOnce invisible, it should be very difficult for anyone to detect a PC (or NPC) without special senses like enhanced smell or tremorsense.An invisible creature can be detected by sound, or footsteps, or odor, but these are not "discriminatory senses" (term taken from Champions). Sound can easily be lost in background noises, odor can be mistaken or covered up by other odors, etc.An NPC with a +2 to Perception should not be able to detect an invisible PC with a +2 to Stealth 50% of the time. It should be possible, but not this likely.</blockquote>