Pillar of Amethyst
From WoWWiki
Pillar of Amethyst is a pillar located in the Lethlor Ravine of the Badlands.[81, 64]
Quests
Using the [Sign of the Earth] the pillar will give a [Amethyst Runestone] to use on the Seal of the Earth for the quest:
[50] Broken Alliances.
[50] Tremors of the Earth
