So, this command adds craftable books that improves stuff like health or speed.
This command has 9672 characters.
You can craft 6 different books by throwing 2 items on the ground: blaze powder + book, glinstering melon + book, rabbits foot + book, iron ingot + book, nether star + book or dragon egg + book
If you put the book you created with the crafting I explained in your off-hand slot you can use the main hand for everything else. This book does work in your main hand but it is not advised.
It is advised to use it in snapshot 15w31c because in 15w32c the signs bugg and in 1.8.8 you can't use double wielding. you can use it in 15w32c because it just works the same but the signs that delete the module bugg. I don't know if this is gonna work in 1.9