i've collected all the stones EXCEPT the esutanamus stone. i'm at the location to loot it, and it says i'm not allowed, because it is unique and i already have one. However, i do not. It's showing up on the map as the location to get it, it is listed as the last stone i need on my quest log.

i checked my other character, and she does not have it either.

So... i'm a bit frustrated, as there was a lot of running around to do for this quest, and now i can't finish it.

Please help.

(posting here to hopefully get more attention/help)