Video Guide: https://www.youtube.com/watch?v=xeHiqEewQiQ
Accept Powering the Defenses from [npc=81789] at coords 55.6, 67.8.
1. Powering the Defenses - (Video) - Travel northwest, along the paved path, to coords 58.6, 65.0.
• Go down the steps to 51.1, 29.1, into the Tomb of Lights, and take the passageway on the left, continuing to coords 68.7, 19.7, where you will turn in this quest to [npc=77737], accepting We Must Construct Additional Pylons.
• Exit the room to go into the main passageway and accept the quest Nightmare in the Tomb, from Yuuri at coords 52.3, 38.1.
2. We Must Construct Additional Pylons - (Video) - Enter the room across the hall from where [npc=77737] was located at coords 45.9, 35.9.
• While proceeding through this room, pick up 6 [item=110253].
• Continue to the end of the room and click on the [item=110271] at coords 32.0, 48.4.
Nightmare in the Tomb - Exit the room and take a right to travel down the stairs (coords: 53.2, 38.6).
• Defeat [npc=76745], located at coords 61.6, 67.8
NOTE: If there are any additional [item=110253], that you need for the quest, they can be looted while you make your way to complete Nightmare in the Tomb.
Exit the Tomb of Lights, and turn in Nightmare in the Tomb to Exarch Maladaar at coords 55.6, 67.7, and We Must Construct Additional Pylons to Soulbinder Tuulani at coords 65.1, 67.4.