The wizard incants words of power and crashes his staff against the ground with a flash of light. With a shower of golden motes a single piece of terrain - such as a wood, building, a hedge, or length of wall - crumbles into glittering dust. The terrain is removed. Any models occupying the terrain are unaffected - if slightly surprised. Transmutation will not work on a hill. this being more by way of an undulation in the ground than a construction.