“The strange magical device resembles nothing you've ever seen before. It's certainly not of blood elf manufacture.
As you sense spirits moving closer to the building, the orb glows with a greater intensity, which fades as the spirits leave. There's no question that it plays a role in the corruption of the ghosts.
How it works remains a mystery. Perhaps Custodian Dieworth will have some insight if you can provide the remains of some of the spirits along with your observations.”
