According to this episode this is the same Luna, who used to grant death to the immortals in the past but now is, some believe, in the business of granting life to the all too mortal people. It doesn't seem like it quite works, though, or at least there's some serious trick involved, and I'm inclined to think it's not just a psychological trick.

Leda certainly got what she deserved. Maybe she will stay forever beautiful now as a statue...

Edit. Hmm... Maybe the ruin was in the beginning a limited method to grant a death to an immortal, but now it's reversed, the ruin being everywhere and Luna being able to control it in individuals.