Chapter 10

Right at the beginning, after forming the key at the center of Vigrid, turn it so that it goes to the right until it connects with a lone platform. The chest is on this platform.

After getting Chest #31, start going back but before going back to the key, stop when you reach the arch leading back to town. Double jump to the top of it to find the next chest.

After defeating the three Kinships (enemies), jump across them and you'll see a light platform (a temporary platform that appears) behind the last one. The chest is on this one.

Right after opening Chest #33, look to your right to find another light platform in the distance. Turn into a crow (a transformation) and fly over to it and open the chest on it.

Right near the Gates of Hell (a landmark), like literally right next to it, there's a fake wall. Break it and turn into a beast (a transformation) and double jump over to the hidden platform. Defeat the Grace & Glory (enemies) and then the chest is all yours.