Darnassus Attacked?
Darnassus Attacked? is an Alliance-only quest for level 15-35. It is step 23 of 43 in the Operation Shieldwall storyline. The quest's turn-in marker is in Darnassus at 38.9, 32.8. It rewards 1 reputation reward, 2,400 experience and money.
Description
As you know, our night elven allies moved the Divine Bell you retrieved to Darnassus for safekeeping and study. Moments ago, they portaled some Highbourne mages over here to ask for backup. Details are hazy - some sort of stealth attack on the city?
I don't know what to make of it, but Jaina Proudmoore is already on the scene and I suspect they need all the help they can get.
Speak to Seamus Goldenkicks over there for a quick portal to Darnassus. Find Jaina!

