The Wolf is one of the twelve Guardians of the Beams that hold up the Dark Tower. The Wolf has a cybernetic form, similar to Shardik. According to Dark Tower End-World Almanac, the cybernetic form created by the Old Ones is the Wolves from the Wolves of the Calla. Their past function was to protect the beam. Navius's beam counterpart is Babar, the Elephant guardian. They watch over Gan's beam which is the strongest beam out of the 6.