Eldragosa

Eldragosa is a blue dragon ghost located on top of the greenhouse at the Magus Commerce Exchange in Dalaran at the Broken Isles.

At some point after her death she was reanimated as the frost wyrm Shivermaw. It is rumored that she is of Sindragosa's own brood.

Quests
She is involved in the following quest:
 * Memories of Ebonchill

Speculation
Despite the quest and her title hinting that she is an echo of the past, she is labeled as undead, implying she might actually be a ghost. As she appears as Shivermaw, it is possible it is the former.