While wearing this ring, you have advantage on attack rolls against earth elementals, and they have disadvantage on attack rolls against you. The ring has 5 charges and regains 1d4+1 charges daily at dawn. You can expend 2 charges to cast Dominate Monster on an earth elemental (DC 17). You can move through solid earth or rock as difficult terrain. You speak and understand Terran. After slaying an earth elemental, you gain resistance to acid damage and can cast Stone Shape, Stoneskin, and Wall of Stone.