When you reach admired with the Lightning circle you will get some more quests. In these quests you will have the check the energy of the rune stones. You do this by clicking the same symbol as it green on the stone. It took my two days to finish the rep, but I didn't find all the stones, so it may only take you one. Here is where the stones are placed about the map. As far as I can tell the same ones are active everyday. Choose a route and race around the island getting them, you can even make it fun with a friend. Make sure to bring your rune wand!