In Nightmares

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.