You’ll need it to upgrade certain sets of armor, so hang onto all that Dust of Realms (and other items) you get from finding all of these. Realm Tears always reward you with rare crafting material you can’t find anywhere else. Early in the game, the enemies are going to crush Kratos, so it’s best to leave most of these Realm Tears for later. These holes in the fabric of reality actually give you some pretty good rewards - if you can deal with the deadly enemies they spawn. Seen any mysterious black holes floating around Midgard lately? In God of War, the big man himself Kratos can find strange objects called Realm Tears.
