"Blindsight" was a general term for the natural ability of certain creatures to perceive their surroundings as well as a sighted creature yet without using visual senses. Senses that could contribute to a creature's overall blindsight included enhanced hearing, an acute sense of smell, sensitivity to vibrations, or such specialized senses as echolocation. Because the sense of sight was not involved, a creature with blindsight was not hindered by such spell effects as invisibility or darkness.[1]


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  1. Skip Williams, Jonathan Tweet, Monte Cook (July 2003). Monster Manual 3.5. (Wizards of the Coast), p. 306. ISBN 0-7869-2893-X.