Presenting the letter you received from the sorceress you are able to obtain an audience with Lassering Thay, the High Priest at the Temple of Hades:
“Alcastra was correct when she wrote that she feared there was little I could do for you. The location of Elegrain’s tower was a well kept secret while he was alive, and those servitors with him prior to his death never revealed its location. The only person who could possibly tell you is Elegrain himself. While I am not able to tell you where the tower is located, I may be able to help you in this matter in other ways…”
He will give you a map to the Tomb of Elegrain and a clerical scroll with a version of Speak with Dead. However, before he gives you these items he wants either:
A. “Carved into the Cliffs of Leng is an entrance to an ancient shrine. I would like you to enter the shrine and kill the god Akron. Bring me proof of the god’s death and I will give you the map and scroll” or
B. “In the Broken Lands is a narrow entrance to a box canyon. In that canyon is a ruined abbey. In the darkness below that abbey is a pool where the dread Black Lotus blooms. I will give you a silver knife to harvest the Black Lotus blossoms. Bring me three blossoms and I will give you the map and scroll. However, do not touch the blossoms for their touch is death.”