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Slay Wyrmcaller Vile and use the Wyrmcaller's Horn to call down and slay Glacion. Then, return with the horn to Mage-Lieutenant Malister at Westguard Keep.
Suggested Players 
You were right to bring this to me, <name>. You must take help back north with you to Gjalerbron and slay that wyrm and its master, Wyrmcaller Vile!
Even now, as we speak here, the frost wyrm may be on its way.
However, if I'm reading these plans correctly, blowing the wyrmcaller's horn on his platform, outside in the rear left area of Gjalerbron, will call Glacion back. When the creature lands, destroy it!
And <name>, please bring me the horn. We wouldn't want it falling back into the wrong hands.
You will also receive: 10
Is the attack averted? Are the frost wyrm and its master destroyed?
Did you retrieve the horn?
Wow, that horn is cold!
Once again you've saved Westguard Keep from certain doom. What a curious <man/woman> you are, <name>. If only there were more of you.
Well, this certainly calls for a reward. Which do you prefer?
Upon completion of this quest you will gain:
Aggro Wyrmcaller Vile and kill him to loot the horn. Heal up. Use the horn to call down Glacion.
Quest progression Edit
-  Gjalerbron Attack Plans
- [72G2] The Frost Wyrm and its Master