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“The rapport you’ve developed with the inhabitants of Dun Niffelem has yielded some unexpected discoveries. For example, you somehow find yourself able to understand the denmother’s guttural growls and sharp quips – at least you think you do. It would seem that she senses danger outside the stronghold and wants you to do something about it. With her forepaw, she removes the chain from around her neck and lets it drop at your feet.
As you pick it up you notice an aged fang attached to it….”
-Frostworg Denmother
You must defeat 3 Stormforged Spies in the Valley of Ancient Winters. Using the Ethereal Worg’s Fang at the Corpse of the Fallen Worg will summon an Ethereal Frostworg, which will expose hidden enemies. You are to return to the Frostworg Denmother in Dun Niffelem when the valley has been cleansed of spies.
Provided item:

You will be able to choose one of these rewards:
You will receive:
Upon completion of this quest you will gain:
Quest Giver: Frostworg Denmother — Dun Niffelem, Storm Peaks [63.5, 59.7]
Objective: Defeat 3 Stormforged Infiltrators in the Valley of Ancient Winters by summoning an Ethereal Frostworg to sniff them out.
Quick Facts
Walkthrough
Step 1: Accept from the Frostworg Denmother
Step 2: Go to the Corpse of the Fallen Worg
Step 3: Follow the Worg
Step 4: Return to Corpse and Repeat
Step 5: Return to the Frostworg Denmother
Tips
/target Ethereal or watch for the blue selection circle at your worg’s feet to distinguish yours from identical translucent white wolves running through white snow.
Lore Context
The Frostworg Denmother is one of the more charming quest givers in Storm Peaks. She’s not an NPC with dialogue boxes; you’ve developed enough rapport with the inhabitants of Dun Niffelem that you can understand her growls and body language.
She senses Loken’s iron dwarf spies infiltrating the valley around the frost giant homeland and enlists you to hunt them down using the fang of a fallen worg, which summons its spirit to track by scent.
The Stormforged Infiltrators are iron dwarves using stealth or concealment to scout Dun Niffelem’s defenses, hidden beneath the snow until the spirit wolf sniffs them out. This is one of several quests emphasizing that the war between the Sons of Hodir and Loken’s Stormforged forces is an ongoing, active conflict, not a historical one.
Easter Egg
Explore the Storm Peaks’ hidden easter eggs, lore mysteries, and connections across Warcraft history in Vikstone’s Storm Peaks Chronicles, along with the complete quest storyline.
Vikstone's War JournalThe frostworg denmother growled at me as I came past her, and I found that I understood it. Or believed that I did.
She dropped a chain at my feet. An aged fang hung from it.

Not hers. She still has all of hers.
The corpse was out in the Valley of Ancient Winters, one of her pack, dead long enough that the snow had done most of the work on it. I knelt and used the fang, and something came up out of the ground with the shape of a worg, and it looked at me once and then away and began casting about.
Three infiltrators revealed. Three infiltrators dead.
I slid the chain back over her head when I got in. It took some managing at her height. She licked my face for it.
She has worn one of her dead around her neck for years and it still hunts for her. Njormeld cannot make the horn go back together. Calder’s ice is nearly all eaten.
The frost giants had a use for Vikstone that ran further than sentry duty, because Hodir’s spear needed making before anybody could throw it, which meant Forging Hodir’s Spear.