Seal of the Earth is a pillar located in the Lethlor Ravine of the Badlands.[82, 50]
The area is guarded by elite drakes (Scorched Guardians).
Using the items: [Diamond Runestone], [Amethyst Runestone], and [Opal Runestone]
The seal will be broken releasing the black drakes Blacklash and Hematus. No thanks given, they attack those who freed them immediately.
Both drakes need to be killed for the quests: