Velen states that if the blood elves have been opening rifts between this island and the Outland, there will be residue or anomalies left in the areas where the portals have been opened. You must search the island for locations that exhibit or display these anomalies.
Be warned, <name>; some of these anomalies will be creatures from the void itself. Should you find void anomalies, slay them! Report back to me with any new information that you may find. Begin your search to the north, near the Warp Piston.
How many did you say you saw at the Warp Piston? Just how many times have they opened up this sun portal? This is very bad news...
Alas, you have learned all that I am able to teach you, <name>. Kuros will call for you when it is time.
The title of this quest is a reference to a radio sketch done by the Dead Alewives called Dungeons and Dragons, in which a player insists on casting a spell at nothing - "I'm attacking the darkness!"