This is another type of darts, but far better the first darts you got. The Osprey-feathered Darts are used to play the game of darts with the man in mustache at the Pub. You already beat him before but you play another time for a second challenge.
How to Get the Osprey-feathered Darts
You will learn that the photo you taken earlier was fraud, so you confront the man in the rowboat about it. He will leave you the boat. You will use this on your next mission. Now go back to the pub and talk to the two guys on the left. They will tell you that you will find the Loch Ness underwater, you will need Submarine Ticket to get to it. They will give you Submarine Ticket if you can beat him in darts, this time you will use the Peregrin-Feathered Darts. Once you beat him, he’ll give you a Submarine Ticket and Osprey-feathered Darts.