For example, a copper amulet in the human world may be seen existing in the Twilight as a small ball of fire. Night Watch hinted that animals do not always follow the same rules as humans or Others when it comes to the Twilight. In the first book of Night Watch entitled Story One: Destiny, Anton explains that "For cats there is no [human] world or Twilight—they live in all the worlds at once." There is only one natural inhabitant in the Twilight, a dark blue moss that grows along many surfaces of the sepia-toned human world in the first level of the Twilight. It feeds off of the emotional energy of Others who enter into the Twilight and of humans in the ordinary world. There is a theory mentioned in the books that states that large colonies of dark blue moss can unbalance the human psyche and cause psychosis but it has not been proven. Nonetheless, the protagonist of the Night Watch—Anton—occasionally feels compelled to utilize magic to burn off the blue moss at points in the story. Mysteries The Twilight is still largely an unknown. This may be because there are very few truly powerful magicians who can successfully navigate its levels. Night Watch mentions that the deepest levels have been navigated by Zabulon (see character descriptions below) but at the cost of great energy expenditure even to him. When an Other dies of natural causes, is killed, or dematerialised (executed) their "soul" or "essence" is passed into the Twilight where it remains for all eternity. Since Others are 'born' in the Twilight it would make sense for them to return there upon their death but the reason for this is never stated in Night Watch. They become spectral-like figures, cloudy silhouettes of their former physical selves. It remains a mystery whether or not they retain any memory or feeling as they hardly communicate with living Others who enter the Twilight. In the second part of the Night Watch, what is assumed to be a dematerialised Other in the Twilight seemingly communicates with Anton as it points him towards the TV tower where the Day Watch has set up its field headquarters as it searches for Anton (who is being framed for killing Dark Others). Anton is unsure if it is a dematerialised Other, or if it is simply a part of a trap put into place by