Some Blobmounds began growing taller instead of wider, which despite this, they have been able to survive like this in adulthood for the mere fact that their base is tough and bony, resulting in the Hilltree Blob. They have two stages in life, one where they are mobile and behave like their ancestor, and the other where they begin developing a bony shell around their base and growing upwards until they reach a certain height. Their bony 'trunk' protects them from many predators in adulthood, and also gives additional support. Above this is mostly covered in photosynthetic area, with the exception of their face, which remains white. Their photosynthetic area is also covered in groves and wrinkles to trap heat and gather more light. Occasionally, a new individual begins forming on the surface of an adult's body, before falling to the ground as a juvenile. Juveniles are often rather small in comparison to other Cold Dooms, being roughly 15 meters wide upon birth. While their spores are equally as light as their ancestor's, they are completely unable to live in the Equatorial Stillfreezing Ice sheet as a result of their size, and if any do manage to grow, they do not survive long.