Hag Stones, Holy Stones, Odin Stone, Witch Stones, Adder Stones, Snake Eggs, Hex Stones, Fairy Stones, Holeys, and Eye Stones; whatever you want to call them are a great addition to your add to your practice. Each little piece of history and craft has a different usage for them but one thing stays the same they are used for protection and for connecting with spiritual planes/realms.Most are found in dry riverbeds or along the seashore, as the action of running or moving water causes the erosion that result in the unique appearance of the stone.