Gnoblars are often coerced to climb into makeshift crow’s-nests at the top of Ogre banners. From their precarious perch, the Gnoblar is expected to give warning to the Ogres below of incoming enemy fire.
A champion or character that has joined a unit with this special rule may make a “Look Out, Sir!” roll if there are two or more rank and file models in the unit (rather than the usual five). In addition, you may re-roll a “Look Out, Sir!” roll if there are five or more rank and file models in the unit