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Message: <blockquote data-quote="Mistwell" data-source="post: 7675596" data-attributes="member: 2525">Clarified by tweets from Crawford on this.  Tremorsense does indeed see through cover, while blindsight does not.  From MM:Tremorsense: "A monster with tremorsense can detect and pinpoint the origin of vibrations within a specific radius, provided that the monster and the source of the vibrations are in contact with the same ground or substance. Tremorsense can't be used to detect flying or incorporeal creatures. "Blindsight: "A monster with blindsight can perceive its surroundings without relying on sight, within a specific radius ...If a monster is naturally blind, it has a parenthetical note to this effect, indicating that the radius of its blindsight defines the maximum range of its perception."Notice the emphasis for blindsight is simply perceiving surroundings without sight - it's just like normal vision, with regular perception checks, except you don't use your eyes, and you don't need light.  It doesn't imply you can detect things around obstructions, as it still otherwise follows the normal perception rules which require line of sight to perceive something.For tremorsense though, you sense vibrations in a radius.  It doesn't matter if there is a door or wall or curtain in the way, as long as they are in the range and on the ground, you can detect them there.  It's an exception to the normal perception rules.</blockquote>