Kena: Bridge of Spirits

There are a total of 10 pieces of Spirit Mail that you need to find and then return in the Village. Clearing the corruption from the houses that use the Spirit Mail will give you Karma, so it is recommended you try and do these as you go, but don't worry too much if you feel they're starting to become a bit tedious (compared to the other collectibles, the Spirit Mail tends to be well off the main path and hidden in pretty secluded areas, making them a bit of a pain to get). There is freeplay after you complete the game, so if you don't get all 10 by the time you finish the game, you can clean them up afterwards. For their locations (and all of the other collectibles in the game), please see the Collectible Guide found here.