Alliance Words of Power
Thassarian at the Wailing Ziggurat wants you to go to the Temple City of En'kilah and retrieve High Priest Talet-Kha's Scroll from the Spire of Pain, High Priest Naferset's Scroll from the Spire of Decay and High Priest Andorath's Scroll at the Spire of Blood.
Description
The lich has spoken, <name>. The high priests of En'kilah hold the secret to entering Naxxanar.
Go to the Spire of Blood, the Spire of Pain and the Spire of Decay and slay each of the priests.
Return once you've obtained the three scrolls.
You will need to use the stairs that are on the outside of the building in order to reach Andorath's room in the Spire of Blood (center temple).
Talet Kha is up the stairs on the right hands side of the Spire of Pain (right temple). You'll want to destroy the webs and then kill him.
For Neferset, go to the Temple of Decay (far left temple) and up the ramp. Kill the channelers and then kill it.