You will need to clear three Strongholds in 's Kehjistan region: Alcarnus, Altar of Ruin, and Omath’s Redoubt. Each of these Strongholds has its own challenges and bosses, but once you've cleared them all, you will gain access to an Altar of Lilith. Once you've cleared each Stronghold, you will gain access to a new public area and any vendors, side-quests, or Waypoints it contains.
Unlike dungeons, Strongholds can only be completed once. They're intentionally leveled a little higher than the player, so be ready before heading into each one. Having a build fit for The Gauntlet would help you out here, as dungeons and Strongholds hold similar challenges. No matter what build you run, get geared up and head to the first Stronghold in Kehjistan: Altar of Ruin.
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You can reach this Stronghold by traveling northeast from the Iron Wolves Encampment. Once you arrive,you will need to destroy the pile of rocks towards the center of the Stronghold to enter the Altar of Ruin. Move to the northwest, then kill the Triune Worshippers to receive the first of three Ritual Chamber Keystones needed to open the Ritual Chamber.
The minimum recommended level for the Altar of Ruin Stronghold is 45.
Once you have all three, go to where you got the second keystone and place the stones in the door. This will unlock the Ritual Chamber, which houses Dark Cardinal Maldu, the boss of the Altar of Ruin. Defeat him; then, you will need to interact with and rekindle the Wanderer's Shrine in the south of the area to unlock the waypoint and clear the Stronghold. After finishing up here, you can head to the next Stronhold; Alcarnus, to the east.
South of Kehjistan's Jirandai Waypoint, you will find the Alcarnus Stronghold. The Jirandi Waypoint is the easiest way to get there, but you can also take the long road from Zarbinzet, heading to the northwest
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