From wow.incgamers.com

Quest

Lieutenant Lisande: The Lich King has sent his undead upon our very doorstep; we cannot remain idle! Surely you will step up to defend Thunder Bluff from these accursed invaders?

There are strange runic circles outside, glowing with the same energy that surrounds the undead and the Necropolis above. They have significance, I'm certain, and I want you to find out what. Thin the numbers of those aberrations while you're at it; bring me proof of their death along with your results, and I will reward you. Go!

Quest Objectives

Collect three Dim Necrotic Stones from the Scourge outside Thunder Bluff and investigate the glowing runic circles near their encampment.

Locations

• You can find Lieutenant Lisande (human female) at the bottom of Thunder Bluff's western lift.

• The runic circle is found south of Thunder Bluff's mesa. Follow the road. It is on the south of the road, and west of the small pond shown in the map.

Conclusion

Lieutenant Lisande: Have you investigated the invasion yet? There's no time for dawdling!

Hmm. From what you've told me, the voices within the circles ... they must be used for communication of some kind. I shudder to think what unnatural minds are contacted through such magic. Regardless, you seem to have emerged whole and sane. The Argent Dawn appreciates your service.