Shield of Arrav/Black Arm Gang

To join the Black Arm Gang, talk to Charlie the Tramp located just north of the south entrance of Varrock. Tell him you are looking for the Black Arm Gang, and he'll hint that their headquarters is down the alleyway. Enter the building to the south-west, then talk to Katrine.

Tell her you've heard about the gang and that you won't give your source. Ask her if you can join and if she'll give you a try, and she will ask you to steal two crossbows from the Phoenix Gang.

To steal the crossbows, you will need the weapon store key, obtained by your partner in the Phoenix Gang section of the quest, after they have successfully joined the gang.

Once you have the key, head towards the Phoenix Gang's hideout, located east of the southern entrance to Varrock. Directly south of the rune shop and attached to the chapel is a small room with a ladder inside. Climb it and you will enter a room with the crossbows. If you try to take them, the Weaponsmaster will prevent you and attack - you will have to kill him first.

Note: Another player with a second weapon store key may kill the weaponsmaster for you if you are low level or do not wish to gain combat experience. Your Phoenix Gang partner can obtain two keys with the drop trick when talking to Straven, so that you may both enter.

Once he is dead, take two Phoenix crossbows. Return to Katrine and she will make you a member of the Black Arm Gang. Go upstairs in the hideout and look for a cupboard, which contains the right half of the Shield of Arrav.