blind

A blind creature relies on special senses, such as blindsight or tremorsense, to see within a specified range, beyond which the creature can't see. The creature is immune to gaze attacks and cannot be blinded.

Published in Monster Manual 2, page(s) 216, Monster Manual, page(s) 280, Rules Compendium, page(s) 308, Monster Vault: Threats to the Nentir Vale, page(s) 122.