This isn't a quest and does not appear anywhere but is a good way of getting tribute. Search for a path which goes down near where you begin on the fourth land, follow it and you will eventually meet a man in a cave which you can get tribute by throwing, the further you throw him the more tribute you recieve.

This mode where the game objectives are disabled becomes unlocked when you have completed the game, you go back to the second Norse land and keep all the things you spent your tribute on.