Voldrum

Voldrums are small combat rodots made by the Alimbic to protect their artifacts. They are spherical mechanoids that roll on a red wheel and shoot at Samus with guns mounted on their sides. There are five differant varieties of Voldrums, named for what kind projectile they shoot: normal Voldrum, normal Voldrum without guns, Magma Voldrum, Ice Voldrum, and Electro Voldrum. The Voldrums without guns try to ram into Samus, for lack of a better way to impede her.