Koltira Deathweaver at Agmar's Hammer in the Dragonblight wants you to enter the world of shadows and defeat 6 Shadowy Tormentors. Speak to Koltira Deathweaver should you need to re-enter the world of shadows.
While you have done much for me, one task remains.
Beside the world you know exists another world. It is from that world, the world of shadows, that my tormentors assault me. While I am powerless to face my own demons, you could end their reign of terror. You have the strength, I have seen it with my own eyes.
Enter the world of shadows and face the demons that torment me!
Do this and I will translate the tome, as promised.