The character with this ability can take the shape of an elemental at will. It may be used once per day at the sixteenth level, twice per day at the eighteenth level, and three times per day at the twentieth level. The transformation as a duration of 1 hour per class level. Available shapes include air, earth, fire and water elemental forms. At the 20th level, the druid may assume the elder form of any of these elementals. Use: Selected. After choosing the ability the player must choose an elemental form to take.