I Affect the World; the Story of Mala (Items)

I think I should present these real quick:

Items. The important part of gameplay in BBNR. They help you get through seemingly impossible obstacles like walls, chains and doors.

Here are the 5 Items Mala can use during the game.
(A note here: In Chapter 6: Final Steps, you're unable to use your Items. Check the bottom to find out why.)

Item 1 - Double Jump Boots

The first Item you HAVE TO obtain are the... you know already. Double Jump Boots.
The ability is also obvious; Double Jumping. However, the Double Jump is a short one, giving only a bit more height.
With the Upgrade "Equal Double Jump" your Double Jump is just as high as your normal jumps.
The Item is lying around in level 1-3. (?)

Text Boxes:
"You've obtained the Double Jump Boots!"
"With these, you can jump twice before landing. Not sure, why."

Item 2 - Boxing Glove

The second Item is the Boxing Glove. It works like a boomerang.
It's supposed to be used on tight levers to open doors or something to do with attacking enemies?
Every time you send it flying, it bounces from any wall or enemy it hits.
With the Upgrade "Solid Boxing Glove Toss" your Boxing Glove goes through anything and returns normally back to you. This can be used on blocked levers, too.

The Item is obtainable after beating Mama Boxer in level 1-6.

Text Boxes:
"You've obtained the Boxing Glove!"
"Press <Boxing Glove key> to throw the Boxing Glove. It returns like a boomerang."

Item 3 - Rock Thorn

The Rock Thorn actually comes from Hock's remains as he is destroyed by Klyde.
As how it works... It's a short-range weapon. It deals more damage than Boxing Glove, though...
The effect is a short animation of Mala swinging the Thorn. Used for cutting rope and chains carrying planks or boxes. (?)
With the Upgrade "Sharpened Rock Thorn" it will cause twice the damage upon impact, making it a very effective weapon against Ultimate, the optional boss in Chapter 7. (?)
The Item is obtainable after beating Hock in level 2-5.

Text Boxes:
"You've obtained the Rock Thorn!"
"Use <Rock Thorn key> to swing the Rock Thorn. It has a short range but does cut well into rope and chain."

Item 4 - Gem of Darkness (design in progress)

The fourth Item is the Gem of Darkness.
It's used in swapping between reality and shadows (like mentioned in an earlier entry) to get through obstacles and kill enemy shadows. (Required for A Rank)
With the Upgrade "Darkness Rejection" you recover your Stamina right away after returning to reality.
The Item is obtainable after beating Huma in level 3-4.

Text Boxes:
"You've obtained the Gem of Darkness!"
"Use <Gem of Darkness key> to switch between shadows and reality. You have a limited time in there, though..."

Item 5 - Book of the Royals

And lastly, Book of the Royals. It doesn't have any in-game benefit, unless it gives discounts in Nice/Normal Mode.
This is the only Item with no Upgrades. It mostly services as part of the story, not the gameplay.
The Item is obtainable after beating Shadow Mala in level 4-4.

All the Items are stolen by Other Klyde after beating the Gatekeeper at level 5-5. (?) Because he steals your Items, you're unable to use them in Chapter 6. However, playing other Chapters after completing Chapter 5 will still have your Items in use.
(In short: Chapter 6 is the only Chapter where you can't use Items.)

And questions I created and answered:
Why can you use Items in Chapter 7?
- Because it's an extra Chapter that takes place in Mala's dream.

Why do I need Upgrades?
- They are used for 100% completion besides giving benefit.

Why doesn't Book of the Royals have any benefit or Upgrades?
- Because I simply can't figure out anything useful done by a book. Also, there's no way to upgrade a non-existant ability.

(?) - Uncertain

That's all for now.