They can manifest and control a small amount of a single base aspect of ash: Flow, Heat, or Land. They can only control their summoned aspect, not a pre-existing source of it. Element color varies.
They can levitate small objects or hold them in orbit of their body (they must be able to feasibly lift the object with normal strength in order to levitate it; their carrying capacity is limited by how much weight they can lift physically). They can create little asteroid belt-esque rings around them.