The Ranger, also known as the Beast, was a cybernetic battle tank, that guards the redoubt and a city nearby. It was built in Predark times to guard against a Soviet invasion, that never occurred. In the years after Skydark it plagued the people of Novaville, and the surrounding area. After the Son's of the Knife built the Leviathan, the Ranger tank had sought them out for destruction, and when Ryan and his Companions later took it the Leviathan for their own, the Ranger pursued them as well.
Eventually after several engagements the Ranger was finally destroyed. Pandora's Redoubt