|Universe||Ben 10 Universe|
|Average Height||12-60 feet|
Vaxasaurians are an extraterrestrial species of saurians from the planet Terradino, a planet similar to Earth. Based purely on the look of the landscape, at first glance Terradino appears to be the perfect candidate for a dream vacation brochure. It is described as a postcard paradise with sandy beaches and thick jungles, the home to a vast number of diverse animal-like alien species, many creatures big and small. It is a very beautiful planet, with all sorts of mountains, canyons, waters, rivers, plants and fauna.
Tragically, several different intelligent species evolved simultaneously on Terradino, and their relations are not peaceful. Warring factions in every group constantly seek to take control for themselves. However, one particular species, the Vaxasaurians, have been able to temporarily restore order through their sheer physical superiority. The Vaxasaurians are about 12 feet tall and very strong, and have the ability to increase their size and can grow up to 60 feet, but is unknown if they can shrink beneath their normal height. In their normal size Vaxasaurians superficially look like cross between a Human and dinosaur, and the bigger they become the more pronounced their dinosaurian features are, until they look like a anthropomorphic dinosaur with stegosaurid back plates and thagomizers on the tail. Vaxasaurians are strong enough to survive in space for a few minutes.
Vaxasaurians' natural predator is a Tyrannopede, a centipede merged with a carnotaurus and spinosaurus's head. These apex predators can easily defeated and devour a Vaxasaurian with their powerful jaws, strength and the ability to snared their prey with a heavy coated web.
Using the Ultimatrix evolutionary feature a Vaxasaurian's skin will change to green, develop gray horns on his head, arms, chest, and back. At the end of their tail, a mace-like structure is formed. They become bigger and become stronger. They stand 20 ft. tall. They can grow up to 120 ft. It is unknown at present whether their dinosaur features grow more pronounced with size, as it has not been seen to grow. They additionally gain the ability to change their hands and fingers into a missile launcher-like weapon that fires bone fragments.
- Vaxasaurians are based on Earth's sauropod dinosaurs. Both possessing elephant-like limbs, large bodies and long tails.
- They are the supreme species of Terradino and only one species that can defeat and devoured them, The Tyrannopedes.