I think Deian must know that Garmoth was defeated and has gone into hiding.
I have reports claiming that Deian might have fled to the Sherekhan Iron Mine, into Barbarian territory.
However, he must have been in a rush because he left some papers behind.
They look like they were a part of his journal.
I read through them and apparently, Deian have been hearing the voice of Markthanan...

To defeat Deian, we would need to take back the Sherekhan Iron Mine...

Markthanan is also known as the Black Dragon.
He is at the Sherekhan Iron Mine, sleeping...
Most people believe that Markthanan was defeated in the Great Battle.
He survived though, and hid himself deep within the mine to recover.
Now that I think about it, it seems like the Barbarians
took over the mine in search of the same goal as Deian.
The return of Markthanan...
No, we will not let that happen!
We must bring the Sherekhan Iron Mine back under our control...

Completion Target: Durgeff
- Ask about Deian's Journal

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Required actions:

1. Meet NPC: Durgeff