Location: This quest takes place in Ashenvale.

Shortly: Sentinel Velene Starstrike at Stardust Spire wants you to kill 12 Befouled Water Elements and Tideress.

How to: Travel northeast from the quest-giver till you hit the horde camp in Silverwind Refuge. From here go east to find the lake.

The Rewards are 20 silvers and 250 reputation with Darnassus.