Pillar of Opal
From WoWWiki
Pillar of Opal is a pillar located in the Lethlor Ravine of the Badlands.[72, 67]
Quests
Using the [Sign of the Earth] the pillar will give a [Opal Runestone] to use on the Seal of the Earth for the quest:
[50] Broken Alliances.
[50] Tremors of the Earth
