"Oh, it's an oathstone. It enforces oaths. Swear one, you keep it, you get the increased essence recovery of a hearthstone. Break the oath and the oathstone shatters, inflicting bad luck on you." Azure helpfully responds.<br/><br/>The person nods. "As Azure helpfully said, it's an oathstone. If I were an eclipse, I'd have just done it like that, but I'm not, can't so I didn't."