In order to make the Obsidian series more aggressive, two beam machine guns were added to their arsenal, slightly increasing their firepower, just slightly...

Small, four-legged felines that meow and purr. Cats have a tail, pointy ears, and whiskers. There are different breeds of cats found across the United States. Before the Great War, domestic cats were one of the most popular household pets owned by humans. They were known for their companionship and for hunting common household pests, such as rats. Cats survived the nuclear holocaust but were hunted down by the post-War peoples for their meat, and fur. This does not mean, however, that cats are extinct. Like before the war, cats are usually found in human settlements, or wherever people are living. They will flee when confronted with combat situations.

Brahmin are very weak animals that have been domesticated and herded throughout the years since the war. Occasionally they can be seen wandering around in herds, but this is rare. Through their domestication, they have been used primarily for meat and milk, and their hides are tanned to make leather. Traders use them to carry heavy loads, and some people keep them as pets. As a result of the constant exposure to radiation, these formerly normal cows have sprouted a second independent head. Ironically, when Brahmin are born with only one head, they are called mutated. Brahmin also have eight stomachs. Their skin has turned a toasty, dusty orange-red color from the fallout exposure and their horns have become a dirty brown. Their udder has also grown abnormally large (almost dragging on the ground). When Brahmin attack, they utilize their horns and batter into a foe. This is not highly damaging but is still noticeable. When a Brahmin is killed, it will let out a loud bellow and flop to the ground.

Bighorners are mutated bighorn sheep. Humans have since domesticated them for their horns, meat, milk, and hides, but wild herds can be found in mountainous regions, usually in close proximity to banana yucca fruit, which bighorners love. Bighorners are herbivorous and are primarily found in wild herds of three to seven. They are communal animals; if one member of the herd is distressed, the entire herd becomes aggressive. They are generally "laid-back" beasts with surprisingly docile dispositions, in spite of being quite capable of being extremely dangerous when provoked. In combat situations, bighorners are rarely outright hostile. They will not attack unless something comes within 4–5 feet of them or their young. If this barrier is trespassed, they will rear their heads up and bellow, at which point they will charge and ram into their foe. Their head-butting attacks are devastating, capable of sending enemies flying backward or knocking them down. Bighorners can also run very fast, this makes them a very intimidating foe.