Dark Heart (Alliance)

there's a path that heads north up hill slightly. The path will have some lanterns. At the end of the short path there is a stone with a hole in it. It should blink when moused over. This is where you blow the horn.

The place where you need to blow the [item=9530] is actually the vortex between 3 stones. (coordinates 40.6, 8.5) Two tall stones of equal height that stand across from each other on either side of the path and one short stone (hollowed in the middle with glowing yellowish lights) that stands at the end of the path. If you mouse over any of the three proper stones you will get a visual confirmation. (The stones glow with a whitish hue.)

Remember that the horn is in your inventory because it drops from the first harpy that you kill.

The horn will still have a 100% drop rate from the first harpy you kill in the area, but pay attention!

There's no message showing you got it, and there will not be any clickable button anywhere to use it like most other such quests have. You must find it in your inventory and right-click to use it.