I'll be generous and give you a decreasing DC will save each round to manifest as your ghostly self.
As for the mirror guardians... as I mentioned, there hasn't been enough time for anything other than ravens to come through, at all. The two dogs are there, but there are more lights than dogs. Each dog can only manage an attack and an attack of opportunity each. The ravens don't have a high enough BAB to concern the lights enough, esspecially with their aura of menace on.
Here's something to look up at though... if they do teleport away with it, Hunter's army will be streaming into the home of whoever has taken the mirror. Not only that, if the Hunter teleports back to the grove, he'll be able to walk through the portal himself unless the good guys figure out the commands programmed into the mirror (unique to each mirror).
Need Tonguez's move confirmation. Then the body count will be known.