Bring the Cracked Necrotic Crystal to Lieutenant Orrin outside the gates of Stormwind.
On the corpse of the fallen abomination, you discover a cracked crystal, slowly pulsing with necrotic energy.
Is there something you need?
Hm, you took this from the corpse of one of the invading abominations?
We have received word about the necropolis base camps that are being summoned by the Scourge. I suspect they wanted to create one inside Stormwind. It is good that they were unsuccessful.
The Faint Necrotic Crystal appears after the defeat of a Pallid Horror in Stormwind. The quest may be accepted by anyone nearby.