The Lomei Labyrinth Island is a location in The Legend of Zelda: Breath of the Wild. It is also a mazed mini-dungeon located in the Akkala Sea region of the Akkala northeast province of Hyrule. It contains the Shrine quest "Trial of the Labyrinth" and houses the Tu Ka'loh Shrine at its center.
"The Master Trials"
A new treasure chest appears inside the labyrinth upon "The Master Trials" DLC pack installation and after the side quest "EX Teleportation Rumors!" is triggered. It contains a new key item, the Travel Medallion, allowing Link to teleport from anywhere at a temporary quick travel point chosen on the map.