Gravoids were huge pink creatures that inhabited the Aldaros Plains. They built enough air inside them to head to the sky carrying parts of the ground and sprayed smoke below them. Gravoid Brutes were semi-intelligent red versions of the normal purple Gravoid that built their own weapons. They are native to the moon of Ebaro.
Hold Your Ground - Do not let them take more than five pieces of land.
Behind the scenes
CreatureBox's 3D Art for the Gravoid referred to it as the Ground Robber.