Castle Mountain Caves

Set in a Queendom neighboring Olgnen Nile, the mountainous caves are considered both a deathtrap and shortcut depending on who you ask. 
Filled with monsters and their nests, the caves spread through ht main mountains, underground and to the other mountain range miles away. Collapsed routes were sworn to lead to hidden castle dungeons.
Rogues and outlaws make these caves their shortcuts. Legends of braver outlaws made their hideout deep in the caverns, remnants showing proof of their small settlements but noone has lived to tell a true story of what happened, and where and how the largest corrupt guild of Ardus history disappeared in the caves.