Koltira, aboard Orgrim's Hammer, wants you to slay Alumeth the Ascended at Aldur'thar.
It's Alumeth... He's growing in power again. I can sense it. Again his underlings are channeling power to his soul.
If he's allowed to rest, their efforts will soon transform him into a mighty adversary.
Return to his chamber in the north portion of Aldur'thar. Combine his heart, skull, scepter and robes, then use his remains on the crystal there.
Hurry, <race>! Destroy him while there's still time!