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Message: <blockquote data-quote="Anguish" data-source="post: 3193928" data-attributes="member: 27032">Unfortunately, there's a problem with the R-light idea.  Drow A has darkvision 120ft.  Drow B has darkvision 120ft.  The two Drow are 100ft from one another, but Drow A is hiding from unsuspecting Drow B.  Drow A is watching from behind a rock as his prey approaches.  Mysteriously Drow B doesn't say "hey, weird, there's a source of R-light behind that rock, illuminating everything within 120ft of it... must be another Drow, trying to hide from me".Anything sonar-based where the sensor also emits any form of detectable particle doesn't work.  Darkvision as it exists in 3rd edition has to work based on passive detection of something that's already present.Now.  If all objects bar none were constantly emitting R-light, then this could be a possibility.  Drow A's emissions could be drowned out by the ambient R-lighting provided by the rock, the cavern walls, and the Cleric of Lloth sneaking up on HIM because Drow B is just a decoy.Still, darkvision doesn't include shadows, does it?  Oh-oh.  Means this magical R-light stuff passes through things.  So... Drow have neutrino detectors in their heads.  But... if it's neutrinos, sadly... those would pass right through the rock Drow A is using for cover, revealing him utterly.So... darkvision is darkvision.  The end.</blockquote>