I have prepared power stones that when placed near the Seed will disrupt its connection to the Legion.
Take a stone from the table and bring it to the altar of fire atop Dreadmist Peak. Travel west, then north when the road forks. The Peak will be to your left. The safest climb to the top is on its northern face.
And hurry—the stone's power will consume itself in time.
Progress
The Demon Seed still exists. I can sense its power...
Your task is complete. You have destroyed the Demon Seed as Neeru bid. But this is not the end...
The destruction of the Demon Seed sent waves of power through the ether, waves of staggering force. I felt them, and I am sure other beings did as well. Others who will wonder why their toy was broken...
But regardless of future troubles, I have something for you. Neeru sent it as payment. And he bid me thank you.
You will need one inventory spot free to retrieve a Flawed Power Stone, which will be required to complete this quest, from the Flawed Power Stones on the table next to Ak'Zeloth.
The Flawed Power Stones only last for 30 minutes, but if you are not able to complete the quest in this time you may always come back and pick up another stone.
Although Ak'Zeloth tells you that it's easiest to scale Dreadmist Peak from the northern slopes, it is often found to be faster and easier to scale the south-eastern slopes.