This location is in the western part of Porimos Ring. This is one of the most important locations in Assassin's Creed: Odyssey Fate of Atlantis - you get here during the main storyline.
To get inside this location, you need to enter the cave located near the water. You can notice it easily because the door has a golden glow.
This location doesn't have many side rooms and corridors. Keep moving straight.
A lantern is located in the center of the great hall. Destroy it immediately and then deal with opponents. Eliminate them so they don't interfere with your exploration of this place.
A chest is on the left side of the room. Inside, you will find Forged Staff of the Isu.
A chest with knowledge points is in the middle of the room.
Climb the stairs, destroy the enemy and interact with the tablet to complete this location.
Go up the stairs. There, you will find a marble chest - it contains Adamant Ingot.