Now that you and your partner each have a different half of the shield, trade with each other so that one of you has the two halves. Then go to the museum near the church in Northeast Varrock. Talk to the museum owner and you’ll receive Blade Wars Gold two certificates.

Give one of them to your friend. Take the certificate to the King in the Varrock Castle to receive your 600gps and you’ll be done with the quest. Summing it up:

1) – Get another player who hasn’t done the quest to work with you.

2) – One of you must gain access to the Phoenix Gang’s hideout while the other becomes a member of the Black Arm Gang to get into their hideout (look above on details of how to get in).

3) – One of you get a half of the shield while the other gets another different half of the shield.

4) – Trade each other so that one of you has the two halves of the shield.

5) – Bring the two halves of the shield to the Museum Owner in the museum in Northeast Varrock. You’ll then receive two certificates.

6) – Give one of the certificates to the friend who helped you.

7) – Bring the certificate to the King in the Varrock Castle in exchange for your reward.