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Message: <blockquote data-quote="Dausuul" data-source="post: 6491851" data-attributes="member: 58197">Blindsight is not a tightly defined ability. It means different things to different monsters. For a giant bat, it's active sonar. But dragons also have blindsight, and I don't think the designers meant to suggest that dragons make ultrasonic squeaks and listen to the echoes! Dragon blindsight is a combination of multiple keen senses (smell, hearing, taste, even touch) and perhaps a supernatural awareness of their surroundings.Still, the one thing that's very clear about blindsight is that it's non-visual. So obviously nothing that relies on visual concealment alone is going to affect it. Darkness, invisibility, obscurement caused by shadows, and visual-only illusions won't do anything. There's room for debate over fog--some studies <a href="http://www.nature.com/nature/journal/v229/n5286/abs/229572b0.html" target="_blank">suggest</a> that bats avoid dense fog, which might imply that it can interfere with echolocation. However, for the sake of simplicity, I'd rule out fog as well.On the other hand, it's boring if blindsight becomes total awareness. The obvious interpretation of Crawford's ruling, which also strikes me as the most sensible way to handle it, is that solid obstacles do block blindsight. It doesn't let you see around corners, and a rogue who stays behind solid cover can hide from a dragon.</blockquote>