Kill 6 Dalaran Summoners and 12 Elemental Slaves, then return to Magus Voidglare in Tarren Mill.
The wizards of Dalaran constructed a vast, magical dome around the heart of their city. Some believe it was for protection from the violence of these times, while others say they merely wanted solitude, to study and plot.
I don't care what the reason was. I do care that the ruined outskirts of their city, outside the dome, may hide valuable magical treasures.
But the area is patrolled by the wizards and their elemental slaves.
So hunt them, and return when their numbers are sufficiently reduced.