The Neydisa Hauberk quest starts from talking to Jourgensson in the Banderling Castle at 66.4N 50.0E. He will request for some Olde Ispar Stout from Nyadisa Castle (69.6N 17.6E). You will have to make a run to Neydisa Castle to get the Nelvaine's Olde Ispar Stout from Nelvaine the Brewer. While you're here you might as well talk to Lady Tallial.

Welcome to Neydisa Castle. We are a peaceful settlement, but MacDugal's band of raiders has recently re-occupied the castle to the east. I am sure they are planning something vile. If you are able to bring back to me evidence of MacDugal's plans, I will grant you a reward from my castle's armory.

Once you get the Olde Ispar Stout it's time to head back to the Banderling Castle. By giving Jourgensson the Olde Ispar Stout he will give you Jourgensson's Letter. Take this letter to MacDugal. MacDugal is located in the center of the Banderling Castle. By presenting him with the letter he will give you a key and ask you to go into the dungeon to retrieve a bag for Gwillim.

Well, Jourgensson says you're all right. Maybe you can help. Down underneath the castle, there's a prison full of beasties. That idiot Gwillim dropped some notes and his bag in there. Now he says he can't mix potions! Bring the bag back to him, and he'll reward you. You'll need this to get in there.

Now it's time to head down to the Banderling Castle Dungeon. The monsters here consist of drudges, rats, undead and gold wasps. The bag MacDugal asked for is in a room guarded by two Gold Pytom Wasps. Upon approaching the door to the alchemy bag you will find yourself swarm by three white rats. Each individual rat will drop a key with 15 uses to the the doors with monsters behind locked doors within the dungeon. Use the MacDugal key on the door when you feel you can take those two Gold Phytom Wasps. Once you clear the room you will find three items on the corner of the room. Pick up the alchemy bag and the letter. You can pick up the frost infusion if you would like to.

Take the portal next to the room to exit the dungeon. Gwillim is next to the portal and by presenting him with the alchemy bag he will give you 40 frost arrows. Keep the note like he said and take it to Lady Tallial at Neydisa Castle. This piece of note is the proof she needed reguarding MacDugal's plan. Give Lady Tallial the Alchemy Notes and she will reward you for your bravery.

Just as I suspected. Thank you for your bravery. People have complained about the reward I granted for service in the past. Perhaps this antique hauberk will be more appreciated.

Important Items
Olde Ispar Stout	Bought from Nelvaine the Brewer in Neydisa Castle.	Present for Jourgensson.
Jourgensson's Letter	Present from Jourgensson.	Present for MacDugal.
MacDugal's Key	Present from MacDugal.	Unlock the door with two Gold Phytom Wasps.
Key	From White Rat.	Bandit Castle Prison: Bridge Access.
Gwillim's Alchemy Bag	From the floor in the wasp room.	Present for Gwillim.
Gwillim's Alchemy Notes	From the floor in the wasp room.	Present for Lady Tallial.
Frost Infusion	From the floor in the wasp room.	Open wide.
Frost Arrows	Present from Gwillim.	Shoot something with them.
Neydisa Hauberk	Present from Lady Tallial.	Use it.