There are 13 Guardian Stones in all of Skyrim. Each of them contains a blessing for the player. The player may only have 1 blessing at a time and it's up to you to choose.
This video will show you one way of locating the Lover Stone, Shadow Stone and Ritual Stone.
The Shadow Stone will make it possible to go invisible for 60 seconds. It will instantly turn you from spotted to hidden. Very good for lockpicking. Not recommended for combat as the enemy can still hear you.
The Ritual Stone will turn multiple dead enemies to come back to live to assist you for a brief time.
The Lover Stone is a passive stat and it will effect all 18 skills in the game. They will increase 15% faster than usual.
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