This quest is not available in game.
Bring a Mirror Lake sample to Jennea Cannon in Stormwind.
This world has been victim to massive mystic struggles, which tore magic currents from once stable channels. We struggle to determine the effects these changes have caused, and some of us fear the worst!
But I will reveal more of this later. Right now, we need you to gather information.
Here, take this flask. Go to the base of the waterfall at Mirror Lake, southwest of the Stormwind gates, and retrieve a sample of the water there. Return it to me so that I might test it for magical taints.