From the outside one may think that place was a secret hiding place carved inside the mountain but as one explored inside, they would be up to a surprise cause as it was incredibly vast.
Once they explored inside they encountered innumerable runic structures and tattered corpses.
The decayed clothes worn by some showed many patterns indicating extravagance whereas some wore simple tunic clothes and were identified as slaves.
On the corpses of some, there were many chains of gold, diamonds, and many precious treasures. They also had their storage rings intact, some of which were quite rich.
"Damn, this is really a treasure land."
"Now I know why this is known as Lost Jewel."
"Holyshit, if I loot this corpse, I don't think I need to work my ass off and risk my life for meager money. The wealth in this ring is enough for us to last throughout our life."