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Message: <blockquote data-quote="Mephistopheles" data-source="post: 6478936" data-attributes="member: 4460">I don't think there is a definitive answer because blindsight comes from different sources for different creatures.It seems fair to say a bat could not see through a pane of glass with blindsight: from a basic understanding of echolocation it would detect a flat surface. But what about a dragon? A grell? An ooze? More difficult to say because the source senses vary, if they are indicated at all. For example, the grell descriptive text mentions that it senses electric fields (among other things), so it might be able to detect certain things through glass or some other materials.Because it's trying to lump a few different things under one mechanic it's something that's going to be down to interpretation. I'm okay with that, although it does put an onus on the DM to be consistent, even if only with rulings for particular creatures; it may have been better for them to make the ability a little more concrete.</blockquote>