Signed oak shieldbow

The Signed longbow is obtained during the Ghost Ahoy quest. It is an oak longbow signed by Robin in Port Phasmatys after the player beats him in several games of Runedraw.

Acquiring and Using the Bow
Talk to Ak-Haranu, he wants a bow signed by Robin, the master bowman, who luckily is residing in the nearby inn. The bow needs to be an Oak longbow. The player then has to go to Green Ghost Inn. Talk to Robin and he will offer to play a game of Runedraw. It's similar to Blackjack. Spend 100 coins on the game; this may take a few tries, so keep on playing. After spending 100 coins he will sign the bow. Go back to Ak-Haranu and give him the bow; this will then get your next task in order to complete the quest.