This mission is a secret one and also free that you can purchase from Ubisoft Connect (while in game press alt+F2,by default) and purchase the mission with free coins that you had from playing other ubisoft games...if you don't have any coins just take your time ..enjoy Assassin's Creed Valhalla and you will easily get those 60 coins you need for purchase mission and you will also have other rewards but most worthy in my opinion is this mission...it brings you a fun new mission and much more ..