In order to save Nerud and the Zeir, you need to find Alepsis Taura. He is the main NPC custodian, Nerud is on the verge of destruction and only you can find him or Norse will be destroyed. You can get Dara Su's Echo, or activate Sentinel Fortress.
"Are we alone? Nerud was born to answer this question. I was born to be Nerud."
He can be found in the Abyssal Rift in Nerud or the Ascension Spire in Shadowmoor.
The core is located at Sentinel Fortress. But this place can only be opened by collecting all the explorer's keys. Deposit the three keys at the gate and enter Sentinel Keep.
Keys can be found in the following locations:
Explorer's Rest (when you first enter the world)
hatchling
Astropath's Breath
Inside the fortress you'll find a lobby with an elevator in the middle. Hop on it, and this elevator will rise more slowly than the others, while you'll hear the Guardian's voice telling you about his purpose and his mission to save Nerud and the Zell.
Once the elevator reaches its destination, the administrator will tell you to interact with the console in front of the core. Interact with it and this will trigger a cinematic scene of a giant ghost emerging from the core. You must defeat it to complete the mission and allow the Guardian to enter the core so he can save Nerud and the Zell.
WARNING: If you use that key on the console before fighting the boss, you will not be able to return to Nerud after the boss fight in the current storyline. The custodian will yell, "What did you do?!" as the screen fades to black. You will wake up in Area 13 and will not be able to teleport to any Nerud checkpoints. However, you can reset your Adventure Mode or Campaign progress to revisit Nerud.
Nerud's ghost guardian Shahara will drop the Phantom Fragment and the Unknown Fragment when defeated. You can still return to the custodian and talk to him and he will give you Shahhara's Embrace to help him enter. Core bonus bonus.
In this storyline, the Keeper will ask you to confront Dara Su to obtain the Shining Essence Echo and bring it to him.
Once you do this, you have two options:
Echo the custodian. He will give you the heart to absorb.
Don't give it to him and keep it. If you decide to do this, you can obtain the Void Idol from the Replicator under the Custodian.
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