Unknown Arena/Isolated Windmill

The Unknown Arena at the Isolated Windmill in Antique Plateau contains the powerful Elite Sublime Shell boss.

Entrance
The entrance to the Unknown Arena can be found north of the Isolated Windmill marker in north-east in Antique Plateau. Interact with the large Sublime Shell statue north of the Windmill.

Requirement
"There are 5 Tourmaline-shaped slots here..."


 * Requires 5x Tourmaline

Enemies

 * 1x Elite Sublime Shell

Relics

 * Enchanted Mask
 * Metalized Bones