Black Arm Gang:
1. If you chose Black Arm then Katrine will tell you to steal some Phoenix crossbows, this is where your friend comes in.
2. Have your friend go to the Blue Moon Inn and kill Jonny the beard (level 2). Retrieve the Scroll and have him go to the Phoenix Gang headquarters and talk to the gang leader (located in a small house where it will be marked by a dungeon icon on your map).
3. The Phoenix Gang leader will give your friend a key to the Phoenix Gang's weapon storehouse (located in a house to the east of the Gang dungeon entrance). Have your friend retrieve some Phoenix crossbows from the armory and give them to you. Also make sure your friend grabs the other part of the Shield from the Phoenix Gang dungeon.
4. Now that you have the crossbows, talk to Katrine and tell her about the crossbows, then enter the upper area of the gang house and search the cupboard to retrieve the Shield half.
5. Talk to the King and he will tell you to go to the museum to show the Curator. The Curator will give you 2 scrolls.
6. Take the scrolls back to the King and claim your reward.
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