Dear Sir, yesterday noon I accidentally sell around 180K lightstone. If possible please revert back that lightstones.
Thanks

Gratz ... lol

No dude it the point of no return however you may farm Lightstone fragments in the Great desert by offering in the black stone altars and completing temples. You also gain in Ancient Ruin in your camp. or you may purchase it with 300 Black pearls. And make sure to participate in events and complete your quest and daily tasks they sometimes give you Lightstone fragments.