This quest is not available in game.
Bring the Nightmare Shard to Mathrengyl Bearwalker in Darnassus.
- Nightmare Shard (Provided)
This shard holds great secrets; it is the pure essence of the Emerald Dream. However, what I see in this shard is not a dream; one would call this sort of a vision a nightmare.
I do not wish to alarm you, <name>, but I think it is best if you deliver this shard into the hands of a wise druid as soon as you can...
Mathrengyl Bearwalker in the Cenarion Circle is who you need to find. Head to Darnassus. I cannot say more.