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Message: <blockquote data-quote="DracoSuave" data-source="post: 5714134" data-attributes="member: 71571">A creature in the wall can see or be seen by any other creature provided a line between any of the creature's corners can be connected to any of that other creature's corners.So, if there's no wall between said creatures, visibility is just fine.HOWEVEROn the question of concealment.A creature in the wall will have concealment to creatures outside the wall.  This is because at least one [back] corner is blocked from the view of an outside creature.  With less than four lines of sight, concealment is incurred.The creature will not have total concealment, however, because the front corners are NOT blocked.A creature outside the wall will obviously have all four corners accessible to a single [front] corner of the creature in the wall.  Thus, a creature outside the wall will not have any concealment vs the creature inside the wall.PS:  Obviously this changes if either creature has to look through other squares of the wall.  Adjust lines of sight accordingly.-----------------------------------Regarding Obscured terrain:There's three types of obscured terrain.  Lightly, heavily, and totally.  Each operates as exceptions to how concealment works, and does not use the standard line of sight rules.  There is a difference between 'line of sight is blocked' and 'obscured terrain.'  Obscured terrain ignores the corner rules for line of sight completely, and goes ahead and does its own thing.Lightly Obscured:Creatures have total concealment if five or more squares are between you and the target, otherwise, normal concealment.  However, you can still see through those squares, and have -5 to Perception checks. Thusly a totally concealed creature will still actually be visible, unless they Stealth.Heavily Obscured:Adjacent creatures are concealed.  Non-adjacent creatures are totally concealed.  You can see one square away, but no further.Totally Obscured:You see nothing, not even adjacent creatures.</blockquote>

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