- Blackened Urn
- Binds when picked up
- "Though the urn now appears to be empty, it might still be worth something to a vendor."
- Sell Price: 2
Source
This item is provided when you start the quest 
[70R] Nightbane. It was needed to summon the boss Nightbane in Karazhan before patch 3.0.8.
Notes
After you completed the quest, you kept the urn so you could summon Nightbane again in the future. Only one person in the raid needed to have the urn.
Now you can use urn located on the ground in the Master's Terrace in Karazhan.