This is a simple guide on The Gauntlet
You can start by opening the Teleport interface > Cities > Prifddinas
After the teleport you will arrive here
You need to walk North-West till you reach The Gauntlet portal
You will end up in The Gauntlet lobby
You can choose between Crystalline Hunllef and Corrupted Hunllef for difficulty & Better drop rates you can't bring any item's into The Gauntlet
Upon entering you will end up with an item preset to fight the Hunllef
