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Message: <blockquote data-quote="kouk" data-source="post: 4383022" data-attributes="member: 55992">The second paragraph of Perception says "This skill is used against another creature’s Stealth check or against a DC set by the DM. In most situations, the DM uses your passive Perception check result to determine if you notice a clue or an imminent danger."You are free to call for a Perception check when something changes though, or just whenever you want to.The DM has to decide what a fair DC would be for any given situation, there are too many variables to ever account for.You might consider it to be a +2 for each 10 squares away. I think that may be what was meant. However, a creature standing in an open, flat field is not hard to find no matter how far away they are really. Under Vision and Light (PH  262) it says, "You automatically see the obvious, but you use the Perception skill to try to see the hidden." As DM you decide whether something is obvious or somewhat hidden, either because it is hiding or because there are things in the way.200m away is approximately 650 feet, or 130 squares. You can simply say there is no chance of hearing an ogre chewing on something from that distance, because there probably isn't. You might hear an Ogre shouting or talking if there is no wind though. You could probably see it fairly easily though. Just use your judgment as to how hard or easy something would be. The rules given are just guidelines. At that distance, assuming not entirely flat terrain, I would think an easy DC of about 10-15 would be sufficient (though I don't know the area you envision). That would mean Passive perception should see it, but then the Ogre is a big fellow who you say isn't taking any care to avoid notice. On the same token, if the PCs aren't taking special care, they together are about the size of two ogres, and might be even louder.I suspect offering a Perception at a greater distance if possible would be better. Maybe allowing or calling for a (DC 20) Perception check at 1,000 feet. That would let keen-eyed PCs notice the Ogre before it has a chance to notice them.</blockquote>

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