You come with recommendations from Guild Master Yan? Great!
Then let's get right to it, haha!
We need some Spirit of Fire for this necklace.
It's for a new research our guild is conducting.
If you go fight the Helms at Helms Post the Spirit of Fire should accumulate automatically.
Oh, and before you go can I have the letter back? I should get rid of that for you.

Hahaha!
If this succeeds, we will become extremely powerful!

The necklace should be glowing now!
But no... this is not right!
If only I had some [Event] White Moonlight Shards to help it glow more...
Darn it... I suppose you can keep the necklace if you want...

Completion Target: Rudd
- Hand over Secret Old Moon Letter IV
- Defeat Helms

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Required actions:

1. Give item:
   
   
   - Secret Old Moon Letter IV (1)
2. Kill monsters (1000):
   
   
   - Helm Golem
   
   
   - Helm Angry Hammer
   
   
   - Helm Small Mace
   
   
   - Helm Big Mace
   
   
   - Helm Hunter
   
   
   - Helm Hammer
   
   
   - Helm Iron Shield
   
   
   - Helm Two-Axe Warrior
   
   
   - Helm Big Axe
   
   
   - Helm Miner
   
   
   - Helm Raid Captain
   
   
   - Helm Crusher
   
   
   - Helm Destroyer
   
   
   - Helm Devourer