I've never seen one in person, but these stones are definitely seeds of shadow.
They are also known as Black Crystals.
You said that the wolves had swallowed these?
I feel like we are getting close to uncovering a secret.
These rocks can be found all over Night Crow Hill.
I heard that the strange and gloomy atmosphere around this hill is because of these stones.
Take this tool.
With this, you should easily be able to gather some rock samples for me.
After you collect the samples, go straight to the chief.
Night Crow Hill is under the control of Blood Wolves, so please be vigilant.

After you collect the samples, go straight to the chief.
Do not show this report to anyone else.

So that huge white furred one is the leader of those wolves!
Since we defeated them, the people would be happy to hear it, wouldn't they?

Completion Target: Black Spirit
- Speak to Myra
- Face off against Leebur the White Wolf

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Required actions:

1. Meet NPC: Myra
2. Kill monsters (1):
   - Leebur